Cbse maths activity class_3_8_part2

33Grade : 3
Mathematics Laboratory in Primary
& Upper Primary schools

Grade:3-MathmaticsLaboratoryinPrimary&UpperPrimaryschools
33
3
To draw the following figures on a dot paper:
(i) a hut (ii) a joker (iii) a flower
Learning Objective :
Pre-requisite :
Materials required :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Repeat above steps to draw
Observations : Observe each of the figures and note down
To handle ruler and pencil and to identify straight lines, curves and closed
figures.
Knowledge of horizontal, vertical and slanting lines and familiarity with
dot papers.
Adot Paper, a pencil, an eraser and a ruler
(i) Drawing a hut
Mark or identify a dot in the dot paper.
Starting from this dot as first, using
pencil and ruler, draw a horizontal line
upto the sixth dot towards right [Fig.
1(a)].
From both ends of this line, draw
vertical lines downward covering 4
dots [Fig. 1(b)].
Using a ruler join the lower ends of the
vertical lines to get a four-sided
closed figure [Fig. 1(c)].
Proceed further to complete the
figure of a hut by drawing horizontal,
vertical and slanting lines.
(i)Ajocker (ii) a flower
(i) Number of horizontal lines = ......................................
(ii) Number of vertical lines = ......................................
(iii) Number of slanting lines = ......................................
(iv) Number of curved lines = ......................................
(v) Number of triangles = ......................................
(vi) Number of rectangles = ......................................
(vii) Number of squares = ......................................
(viii) Number of circles = ......................................
Fig. 1(a)
Fig. 1(b)
Fig. 1(c)
ACTIVITY 1

33
4
To represent the following pairs of numbers on straight lines using
stickers and to identify the greater number from the representation.
(i) 7 and 11 (ii) 9 and 5
Prerequisite :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Observations :
Extension of the activity :
To compare numbers
Knowledge of numbers.
Two sheets of paper and 40 identical stickers.
Representing numbers 7 and 11 on straight lines
Draw two straight lines on a paper sheet [Fig. 2(a)].
Take seven stickers and stick them
one by one on the first line starting
from one end. Make sure no gap is
left between any two stickers and
also no two stickers overlap each
other [Fig. 2(b)].
Now take 11 stickers and stick
them one by one on the second
line in the same way as above
[Fig. 2(c)].
Observe the lengths of the stickers
and note down that the number
representing longer length of the
stickers, is greater than the other.
Similarly represent numbers 9 and 5 using
stickers and note down the number
representing longer length of the stickers.
Comparing the lengths of the stickers
(i) In the activity (i) greater number is …..
(ii) In the activity (ii) greater number is …..
This activity may also be performed by shading squares in a line on the
grid paper.
11 stickers
Fig. 2(a) Fig. 2(b)
7 stickers
ACTIVITY 2
Fig. 2(c)

33
5
To measure the following :
(i) Length of right palm (ii) Width of right palm
(iii) Length of right ear (iv) Width of smile
by group activity using a ruler/a measuring tape.
Pre-requisite :
Materials Required :
Procedure :
Step 1.
Step 2.
Step 3.
Measuring length of the right ear
Step 1.
Step 2.
Step 3.
(i) To develop the measuring skill
(ii) To collect, display and interprete the data
Knowledge of using a ruler or a measuring tape.
Aruler / measuring tape, a pencil and a paper.
(Activity is to be performed by a group of 4 or 6 students)
Measurement of length and width of the right palm.
One student stretches the palm of his right hand and another student in the group
measures the length and width of the palm using a ruler or measuring tape and records
the observation.
Now, the two students interchange their roles.
All members in the group follow the same procedure in pairs.
One student holds a ruler parallel and close to the right ear of another student and
measures the length of his/her ear.
Now the two students interchange their roles.
Other members of the group in pairs follow the same procedure.
ACTIVITY 3

33
6
Measurement of width of the smile
Step 1.
Step 2.
Step 3.
Observation
tape or a scale.
It should be ensured that the ruler or measuring tape remains in contact with the skin
while making measurement
All the members of the group record the observations.
Group member having longest palm length ...............................
Group member having shortest palm length ...............................
Group member having widest smile ...............................
Group member having longest ear ...............................
Group member having shortest ear ...............................
All the students help each other in measuring the width of ones smile using a measuring
Student Length of Width of Length of
Name the right palm the right palm the right ear the smile
Width of

33
7
To measure the dimensions of the floor of a room in the house using 1m
long thick string.
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
Observations :
To estimate and measure large lengths.
Knowledge of measuring length and its unit.
Thick string, a metre scale, a pencil or a piece of chalk.
Cut a piece of string 1m long using a
metre scale.
Place one end of the 1m string at one of
the corners of the floor and stretch,
keeping it straight along one side of the
floor. [Fig. 4(a)]
Mark the position of the other end of
the string on the floor with a piece of
chalk or pencil.
Remove the string from this position
and place it again away from the corner
along the side of the floor keeping its
one end at the marked position.
Mark the position of the other end of
the string on the floor. [Fig. 4(b)]
Proceed further in the same way and
complete the measurement of this side of the floor, considering lengths (if needed)
smaller than 1 m as ½ m or ¼ m by folding the string.
Record your observations.
Similarly measure the lengths of other sides of the floor and record your observations. Follow the
same process to measure the dimensions of floor of other rooms in your house.
Room Number ...............................
Length of the 1st side ...............................
Length of the 2nd side ...............................
Length of the 3rd side ...............................
Length of the 4th side ...............................
ACTIVITY 4
Fig. 4(a)
Floor
string
Fig. 4(b)
Floor
string

33
8
To count the number of edges and corners of the following objects:
(i) A shoe box (ii) A die
(iii) A rectangular sheet of paper (iv) The alphabet 'O'
(v) A ruler
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Counting corners of a shoe box
Step 1.
Step 2.
Step 3.
Step 4.
To identify edges and corners of different objects.
Knowledge of edges and corners.
Ashoe box, a die, a rectangular sheet of paper and a ruler.
Counting edges of a shoe box
Hold the shoe box and observe it carefully from all sides. [Fig. 5a(1)]
Identify all the edges.
First of all count the longest
edges by rotating the shoe box.
Now count all other edges on the
left side and the right side of the
box.
Hold the shoe box and identify its
corners. [Fig. 5a(2)]
Count all the corners of the top
of the box.
Count all the corners of the
bottom of the box.
Repeat the process for other given objects
and count their edges and corners.
ACTIVITY 5 A
Fig. 5a(1)
Edge
Left face
Right face
Fig. 5a(2)
Corner
Top
Bottom

33
9
Observations :
S.No. Name of the object Total number of edges Total number of corners
1
2
3
4
5

33
10
To record the number of edges and corners obtained after folding a
rectangular sheet of paper from each corner one by one.
Shape Number of edges Number of corners
Pre-requisite :
Material required :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Observations :
To identify edges and corners of different objects.
One rectangular sheet of paper.
Take a rectangular sheet of paper
and observe that it has four
corners. Mark them as 1, 2, 3 and
4. Clearly it has 4 edges.
Fold one of the corners of the
rectangular sheet and observe
the new shape of the sheet. [Fig.
5(b)(1)]
Count the number of edges and
corners of the new shape of the
sheet.
Record the observations.
Fold the second corner of the
sheet and observe the new shape
of the sheet. [Fig. 5(b)(2)]
Count the number of edges and
corners of the new shape after
folding two corners.
Similarly count the number of corners and edges after folding 3rd and 4th corner.
Rectangle
After folding 1st corner
After folding 2nd corner
After folding 3rd corner
After folding 4th corner
1 4
2 3
1
2 3
Fig. 5(b)(1)
ACTIVITY 5 B
Fig. 5(b)(2)
32

33
11
To observe the number of edges and corners in the shape formed by creases
selected after folding a rectangular sheet of paper 5 times and then
unfolding it.
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Observations :
To identify edges and corners in a given shape.
Arectangular sheet of paper.
Take a rectangular sheet of paper and fold it parallel to its breadth near the middle of
the paper to get a crease. [Fig. 5c(1)]
Now fold the folded paper again along the length near the middle to get another crease.
[Fig. 5c(2)]
Similarly for 3rd, 4th and 5th fold follow the directions given in Fig. 3 to 5
Unfold all the five folds of the paper
Select and draw any one closed shape formed by creases.
Record the number of edges and corners of the shape drawn.
Number of edges in the selected shape ...............................
Number of corners in the selected shape ...............................
ACTIVITY 5 C
Crease 1
1st Fold
Fig. 5c(1)
Fig. 5c(2)
2nd Fold
Crease 2
Crease 3
3rd Fold
Fig. 5c(3)
Crease 4
Fig. 5c(4) Crease 5 Fig. 5c(5)
5th Fold

33
12
To make the following shapes using set of Tangram cutouts:
(i) a cat (ii) numeral 4
To explore different shapes using given geometrical shapes.
Knowledge of geometrical shapes.
Two sets of cut outs of the Tangram.
Identify the different shapes of cut outs in a set of Tangram [Fig. 6(a)].
Using all the seven cutouts of a Tangram set placing edge to edge with no space left in
between, obtain the shape as in [Fig.6(b)].
Proceed in the same way to obtain the shape shown in [Fig. 6(c)].
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Fig. 6(a)
2
1 5
4
3
7
6
ACTIVITY 6
2
1
5
4
3
7
6
2
1
5
4
3
7
6
Fig. 6(b)
Fig. 6(c)

33Observations:
Extension :
1. Figure in 6(b) looks like ...............................
2. Figure in 6(c) looks like ...............................
Try to get the shape of
(i) a duck
(ii) a cat in some other posture
(iii) a man in sitting posture
using all the seven pieces of Tangram set.
13

33
14
To make a time table from wake up time to bed time on a
(i) working day (ii) holiday
Table-1
Monday
Time interval of 1 hour Activity performed
(Morning) 6.00 O`Clock - 7.00 O`Clock Getting ready to go to School
Table 2
Sunday
Time interval of 1 hour Activity performed
(Morning) 6.00 O`Clock - 7.00 O`Clock Sleeping
Pre-requisite :
Procedure :
Step 1.
Step 2.
To understand the importance of time and planning.
Knowledge of reading time from the clock.
Apencil and a sheet of paper.
Keeping the time interval of one hour, record the time intervals and the corresponding
activities performed on a working day (say Monday) in the table (I) as shown.
7.00 - 8.00
8.00 - 9.00
Proceed in the same way to record your time and the activities performed on a holiday.
7.00 - 8.00
8.00 - 9.00
ACTIVITY 7

33Observations :
Extension :
(i) How much time do you spend o
................
(ii) How much time do you spend on a holiday for studying? ...............
(iii) For how many hours do you watch TV?
(a) on a working day ................
(b) on holiday ................
(iv) For how many hours do you play?
(a) on a working day ................
(b) on holiday ................
Students can divide themselves in groups of 5 and can make a comparison in their
study time and play time, among themselves.
n sleeping after 6 o'clock on a working day?
15

33
16
To represent multiplication tables of 2 and 3 using lines and dots.
Learning objective :
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
To visualize and understand multiplication tables.
Knowledge of horizontal and vertical lines and process of addition.
Asheet of paper and bindies
Draw two vertical lines as in the Fig. 8(a).
Now draw a horizontal line intersecting the two vertical lines and paste bindies at the
intersection representing 2x1 = 2 [Fig. 8(b)].
Again draw two vertical lines. Now draw two horizontal lines intersecting two vertical
lines and paste bindies at the four points of intersection. These points represent 2x2=4
[Fig. 8(c)]
Repeat the above steps drawing 2 vertical lines and three horizontal lines, intersecting at
six points. These points represent 2x3=6 [Fig. 8(d)]
Repeat the above steps with four horizontal lines intersecting the two vertical lines to
represent 2x4=8 as in [Fig. 8(e)].
Continue the activity increasing the number of horizontal lines one by one upto ten and
complete the multiplication table.
Starting with three vertical lines and intersecting them by horizontal lines, as above
obtain the multiplication table of 3 as shown in Fig. 8(f), Fig. 8(g) and Fig. 8(h).
ACTIVITY 8
Fig. 8 (a) Fig. 8 (b) Fig. 8 (c) Fig. 8 (d)
Fig. 8 (e) Fig. 8 (f) Fig. 8 (g) Fig. 8 (h)

33Observations :
Extension :
Fill in the blanks :
(i) 2x1 = ............ , 2x2 = ............. , 2x3 = .............
2x4 = ............ , 2x5 = ............. , 2x6 = .............
2x7= ............ , 2x8 = ............. , 2x9 = .............
(ii) 3x1 = ............ , 3x5 = ............. , 3x7 = .............
3x10 = ............
You may initiate discussion among the other students for the process of developing
the tables of 4 and 5.
17

33
18
To identify a number as an even number or an odd number.
Note : If the total number of bindies can be paired then we say that the bindies are even in
number. If any one of the bindies remain unpaired, then we say that the bindies are add in
number.
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Observations :
Extension :
To distinguish even and odd numbers.
Knowledge of numbers.
Objects like beads/pebbles.
Pick up a few beads and count
them.
Try to arrange them in pairs.
Are you left with any unpaired
bead? [Fig. 9(a)]
Stick a few bindies on a page of
your notebook as shown in
Fig.9(b)
Count the number of bindies and
record it.
Draw boundaries around pairs of
bindies as shown in Fig. 9(b), so
that no bindi is paired twice.
1. How many beads did you count? ..................
2. Was any bead left after pairing in Step 3. If yes, the number was ..................
3. How many bindies did you stick? ..................
4. Are you left with any unpaired bindi after pairing ? Yes/No ..................
5. Is the number of bindies even or odd? ..................
6. Take a number (say) 36? Is it even or odd? ..................
What about the next number?
1. Take numbers 1 to 30 and classify them as even or odd numbers.
2. A given number of marbles may be distributed in two groups and then the concept of even /
odd numbers can be strengthened.
ACTIVITY 9
Fig. 9(a)
Fig. 9(b)
beads
Bindis

33
19
To understand money transactions.
S.No. Name Re.1 Rs.2 .5 .10 .20 Working
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Observations :
To enhance the ability of handling money.
1. Knowledge of numbers and their addition / subtraction.
2. Knowledge of currency notes of different denominations in circulation.
Artificial currency notes of different denominations.
Make/get some artificial notes of Re. 1, Rs. 2, Rs. 5, Rs. 10 and Rs. 20 denomination
[see Fig. 10 (a)]
Make combinations of notes to make Rs. 20 from this collection.
Each student of the class performs Step 2 and records his /her observation in the
following table
1. Anju 2 10+10=20
2. Neelam 2 1 5+5+10=20
3. Priya 5 1 2+2+2+2+2+10=20
1. Which combination has least number of notes? ...........................
2. Which combination has maximum number of notes? ...........................
3. Which other combination you can make? ...........................
Rs Rs Rs
ACTIVITY 10

33
20
Extension :
1. The students may be introduced to the notes of Rs. 50 and Rs.100.
2. The above activity may be extended using Rs.50/- and Rs.100/- notes for a toy costing
Rs. 250/-.
Fig. 10(a)

44Grade : 4

44
23
To draw the following shapes on a dot paper
(a)Triangle
(b)Rectangle
(c) Square
: To understand of shapes of a triangle, a rectangle and a square.
Familiarity with the shapes such as triangle, rectangle and square.
Dot papers, a pencil and a ruler.
(a) Triangle
Take any three dotsA, B and C not in a line and join them to form a triangle. [Fig. 1(a)].
How many sides does it have? How many angles does it have?
In Fig. 1(a) out of given dots join any three dots to form a triangle using a ruler.
1. can you draw a triangle by joining the dots, D, M and F? ................................ (Yes/No)
2. can you draw a triangle by joining the dots E, M and H? ................................ (Yes/No)
3. can you draw a triangle by joining the dots D, E and H? ................................ (Yes/No)
On a dot paper draw
1. two triangles joining five dots.
2. two triangles joining four dots.
3. three triangles joining seven dots.
4. three triangles joining six dots.
Learning Objective
Pre-requisite :
Procedure :
Step 1.
Step 2.
Observations : In Fig 1(b),
Extension :
A
C
B
D
E M
F
G
H
Fig. 1(a) Fig. 1(b)
ACTIVITY 1

44
24
5. three triangles joining five dots.
Four dots M, N, O and P are
joined to form a rectangle on
the dot paper using a ruler
Fig.1(c).
Count and verify that the
number of dots on the line
joining M and N are four
(excluding M and N)
Similarly count dots on the
remaining sides
Observing and using above
information make a rectangle
by joining four points on a dot
paper.
1. Can you make a rectangle by joining dots, S, R, O and Y, Fig. 1(c)? ................. (Yes/No)
2. Can you make a rectangle by joining dots T, R, W and U? ................. (Yes/No)
3. Can you make a rectangle by joining dots P, O, R and T? ................. (Yes/No)
On a dot paper draw
1. two rectangles by joining six points
2. a rectangle in which one side covers seven dots and the other side three dots.
(e) Square
Dots E, F, G and H are joined to
form a square using a ruler.
[Fig. 1(d)]
Count the number of dots on
each side.
Observing and using above
information make a square by
joining four points on the given
dot paper.
Procedure :(b) Rectangle
Step 1.
Step 2.
Step 3.
Which sides of the given
rectangle have equal number of
dots on it?
Step 4.
Observations :
Extension :
Procedure :
Step 1.
Step 2.
What do you
observe?
Step 3.
Fig. 1(c)
M N
P O
Q
Y
S
WU
T
X R
E F
H G
Fig 1(d)
D E C
A B

44Observations :
Extension :
(i) Can you make a square by joining dotsA, B, C and D in Fig. 1(d)?
(ii) Can you make a square by joining dotsA, B, C and F in fig. 1(d)? ........... (Yes/No)
(iii) What is the difference between a rectangle and a square?
1. Make another square in the interior of the given square using a dot paper.
2. On a dot paper make two squares of the same size.
........... (Yes/No)
25

44
26
(a)To find the centre and radius of a circle by paper folding.
(b)To make a geometrical design using a pair of compasses and a ruler.
(c) To make a pattern of circles with
(i) the same centre but different radii
(ii)the same radius but different centres on the same line
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
This point is the centre of the circle.
Step 6.
To familiarise
Knowledge of paper folding, handling a ruler and compasses.
Sheets of paper, a ruler, a pencil, a pair of scissors, a pair of compasses,
any circular object like a bangle or a bowl.
(a) To find the centre and radius of a circle by paper folding
Put bangle on the paper and move a pencil around it to get a circle [Fig. 2(a)].
Cut out the circle with the help of a pair of scissors [Fig. 2(b)].
Fold it into two halves and make a crease. [Fig. 2(c)]
Fold it again and make another crease as shown. [Fig. 2(d)]
Unfold to get two creases intersecting at a point. [Fig. 2(e)]
Name the centre of the circle as O and the end points of the creases asA,B,C and D [Fig.
2(f)].
with circle and its parts.
ACTIVITY 2
Fig 2(a) Fig 2(b)
Fig 2(c) Fig 2(d)

44
27
Then OA, OB, OC and OD are radii of the circle.
Step
Observations:
Procedure : (b) and (c)
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
7. Measure radii OA, OB, OC and OD
(i) Length of OA= ............, OB= ............, OC= ............, OD= ............,
(ii) Are the above lengths equal? .............................. Yes/No
Draw a circle of any radius using a
pair of compasses and a pencil.
[Fig. 2(h)]
Taking any point on the circle as
centre, draw a part of the circle
of the same radius intersecting
the circle at A and B as shown in
figure [Fig. 2(i)].
Taking A and B as centres, draw
parts of circle and complete the
design as in Fig. 2(j). Can you now
develop another design as in
Fig. 2(k)?
Taking any point on the paper as
centre draw circles of different
radii. [Fig. 2(l)]
Draw a line on the paper and taking a point on it as centre draw a circle of any radius.
Keeping the radius same and by taking suitable points on the line as centres, draw
circles to get the pattern as in figure. [Fig. 2(m)]
C
D
OA B
Fig 2(f)
Centre of Circle
Fig 2(e)
Fig 2(g)

44
28
Observations :
(i) How many circles can be drawn from the same centre but different radii? ......................
(ii) How many circles can be drawn of the same radius but different centres on the same line?
..........................
Fig 2(h) Fig 2(i) Fig 2(j) Fig 2(k)
Fig 2(l) Fig 2(m)
A B

44
29
a. To divide a square by paper folding, to make :
(i) four equal rectangles
(ii)four equal squares
(iii) four equal triangles
b. To divide a rectangle, by paper folding, to make :
(i) four equal rectangles
(ii)four equal triangles
Pre-requisite :
Procedure : For (a) (i)
Step 1.
Step 2.
Step 3.
Step 4.
For (a) (ii)
Step 1.
Step 2.
Step 3.
To visualize rectangles, squares and triangles of same size.
Familiarity with the shapes of rectangle, square and triangle.
Paper cutouts in the shape of a square and a rectangle.
Take a cut out in the shape of square Fig.3(a)
Fold it in the middle so that the two parts completely overlap each other. Fig.3(b). Can
you identify the shapes obtained after folding?
Further fold the paper along its longer side so that both portions overlap each other
Fig.3(c).
Now unfold it. Fig. 3(d).
Take a square cutout again and fold it as in Step 2 above. [Fig. 3(b)]
Now fold it again in the middle along its shorter side. [Fig. 3(e)]
Unfold it. Fig.3(f). Identify four equal squares thus obtained.
ACTIVITY 3
Fig 3(a) Fig 3(b) Fig 3(c) Fig 3(d)
Identify from equal rectangles thus obtained.

44
30
For (a) (iii)
Step 1.
Step 2.
Step 3.
Step 4.
Observations :
Complete the following table:
Take a square shaped cut out [Fig3(a)].
Fold it so that its two opposite corners overlap each other [Fig.3(g)]. Identify the shape
obtained after folding.
Again fold it in the middle along the longer side so that the two parts over lap each other
[Fig.3(h)].
Unfold and identify four equal triangles. [Fig.3(i)].
(a)(i)
(a)(ii)
(a)(iii)
Activity Number of parts Are all the parts equal? Shape of each part
of unfolded cut out obtained by folding
For activity 3(b), take a rectangle and proceed in the same way as inActivity 3(a).
Fig 3(g)
Fig 3(h)
Fig 3(i)
Fig 3(e)Fig 3(e)
Fig 3(f)

44
31
(a)To shade th part of your palm impression.
(b)To fill a given region with thumb impressions.
¼
Pre-requisite :
Procedure : For (a)
Step 1.
Step 2.
Step 3.
For (b)
Step 1.
To visualize
(a) ¼ as a part of whole, (b) interior of a region.
Knowledge of fractions.
Water colours, a ruler, a square paper, a pencil and plain paper.
Place your palm on a squared paper and draw its outline [Fig. 4(a)].
Draw a rectangle surrounding your palm impression [Fig. 4(b)].
Divide this rectangle into four equal parts and colour its one part (only the interior
region of palm)[Fig. 4(c)].
Draw a triangle on a plain sheet [Fig. 4(d)].
ACTIVITY 4
Fig 4(a) Fig 4(b) Fig 4(c)
Fig 4(d) Fig 4(e)

44
Step 2.
Step 3.
Observation :
Mix water and colour in a bowl.
Dip your thumb into it and fill inside the triangle [Fig. 5(e)].
(i) Number of parts in Fig. 4(b) = ..............
(ii) Number of parts shaded in Fig. 4(c). = ..............
(iii)Fraction representing the shaded part in Fig. 4(c) is = ..............
(iv)Fraction representing the unshaded part Fig. 4(c) is = .............. (appx.)
(v) Number of thumb impressions required to fill the triangle is = ..............
32

44
33
To make a tiling pattern on a dot paper using geometrical shapes as tiles.
Pre-requisite :
Procedure :
Step
Step
Observations :
To generate patterns using geometrical shapes.
Knowledge of geometrical shapes, use of dot paper.
Square dotted paper, pencil/pen
1.Observe the given geometrical patterns in Fig. 5(a)(i) and 5(a)(ii)
2.Extend the given tiling patterns using shaded geometrical shape as a tile.
1. In Fig. 5(a)(i), how many line segments have been used to make a single tile?
..................................................
2. In Fig. 5(a)(ii), how many lines have been used to make a single tile?
...................................................
3. The second tiling shape i.e. Fig. 5(a)(ii) can be arranged in different patterns as in Fig. 5(b)(i)
and Fig. 5(b)(ii). Which of these patterns of tiles can be used to fill the given space
completely and which cannot?
...................................................
.....................................
Fig. 5(a) (i) Fig. 5(a) (ii)
ACTIVITY 5
Fig. 5(b) (i) Fig. 5(b) (ii)

44
34
To write a secret code message where all the English alphabets are
replaced by numbers 1 to 26, respectively, in order.
Pre-Requisite :
Procedure :
Step 1.
Step 2.
These numbers may follow a pattern.
e.g.A-1, B-2, C-3, D-4 and so on.
Step 3.
e.g. for the word FRIEND
Observation :
Extension :
To understand coding and decoding of message.
Knowledge of numbers upto 100, playing with numbers by forming
different patterns/sequences, say, even, odd, back counting forward
counting.
Paper sheet and a pencil
Write all the alphabets in order.
Assign each alphabet a number.
Take any word and for each alphabet write the corresponding assigned number.
F - 6
R - 18
I - 9
E - 5
N - 14
D - 4
So, the secret code for the word FRIEND becomes 6 (18) 9 5 (14) 4
Rohit and his friend developed a secret code and wrote:
Cab as 624
Bag as 42 (14)
Meeta and her friend developed another code and wrote
Cab as 312
Bag as 217
Can you write the numbers assigned to the letter 'g' by Rohit and by Meeta?
Take different words and write their codes. Give your friend a message in this coded
form.
ACTIVITY 6

44
35
(a) To measure the length of the boundary line of the top of a book using
thread and a scale.
(b) To measure the length of the boundary line of any shape drawn on a
paper using thread and a scale.
Pre-requisite :
Procedure : For (a)
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
For (b)
Step 1.
Step 2.
Step 3.
Step 4.
Observations :
Extension :
To understand the concept of perimeter of plane figures.
A book, a thread, a measuring tape / centimeter scale and pens with red
ink and blue ink.
Use of a centimeter scale for measurements..
Measuring boundary line of the top of a book.
Take a book
Consider its top. Place a thread at one side on the
top of the book
Mark a point near one end of a string with red ink.
Let this point beA.
Place this point of the string at one of the corner of
the top of the book and stretch it around the top
reaching to the same point. Put a mark again on
the string with blue ink.
Take a centimeter scale/measuring tape. Measure
the distance between the two marks. While
measuring keep the thread stretched.
Record the measurement as length of boundary of
the book.
Measuring boundary of a given figure.
Draw a closed figure on a plane paper.
Mark any pointAon the figure and place one end of
a thread at A and mark this end with blue ink. [Fig.
7(b)]
Strech the thread along the boundary line of figure
to meet again at A mark this point on the thread
with ink.
Measure the distance between two marks on the
thread using centimeter scale.
(i) The length of the boundary of the top of the book is ..................
(ii) The length of the boundary line of the figure in Fig. 7(b) is ..................
Measure the boundary of different plane figures from your surroundings and record
them.
ACTIVITY 7
Fig. 7(a)
D C
Fig. 7(b)
A B
A

44
To arrange cutouts of a tangram set in the shape of the first alphabet of
your name.
Pre-requisite :
Procedure :
Step 1.
Step 2.
Observations :
To make different shapes using given geometrical shapes.
Familiarity with tangram cut outs and their use.
Tangram sets, a pencil/pen and paper sheets.
Take cut outs of a tangram set.
Arrange its different pieces to write the first alphabet of your name. For help see
Fig.8(a)
(i) Number of pieces of tangram used in one letter is ................
(ii) Number of pieces of tangaram used in your name is ................
ACTIVITY 8
Fig. 8(a)
36

44
37
ACTIVITY 9
To measure the heights and weights of all members in a group.
Name Height (cms) Weight (kgs)
Group A Group B Group C Group D
Tallest member
Shortest member
Maximum weight
Minimum weight
Pre-requisites :
Material required :
Procedure :
Step 1.
Step 2.
Step 3.
Observations :
To collect and interpret the data.
Knowledge of using measuring tape and weighing machine.
Ameasuring tape, a weighing machine, a pen/pencil, paper sheets.
Divide the class in small groups say of 5
members each.
In each group one member should
measure the heights and weights of
other members.
Record the heights and weights of all
the members of a group in the
following table:
1. Compare your observation with other groups.
Height Height Height Height
Height Height Height Height
Weight Weight Weight Weight
Weight Weight Weight Weight
Name the tallest member in the class? ____________
Name the shortest member in the class? ____________
Name the member having maximum weight in the class? ____________
Fig. 9(a)

44
Name the member having ____________
What is the height of the tallest member? ____________
What is the height of the shortest member? ____________
1. Collect the data of the different sports liked by children, favourite colours, favourite food
items, favourite hobbies and record the data of the entire class and find:
(a) Which item (say a particular sport) is liked by maximum children
(b) Which item is least liked
2. Collect the data of the time taken by different students of a class, in 100m race and prepare a
table to find
(a) the student who took the least time
(b) the student who look the maximum time
minimum weight in the class?
Extension :
38

55Grade : 5

55
41
D C
A B
Fig. 1(a)
D
A
B
2
1
Fig. 1(b)
B
D C
3
Fig. 1(c)
D B
Fig. 1(e)
4
5
6 7
To make a set of Tangram cutouts by paper folding and cutting and to
make geometric figures using its pieces.
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
Step 8.
Step 9.
To familiarise with geometrical figures.
The knowledge of basic geometrical shapes : triangle, square, rectangle.
An 8x8 grid, a pair of scissors, a pen/pencil and a ruler.
1(a) To make a Tangram set.
Take a 8x8 grid and label it asABCD, which is a square.[Fig. 1(a)]
Fold the square ABCD along BD such that point 'C' falls on point 'A' and mark the crease
BD.
Unfold the grid and cut along the crease.
Take any one cutout obtained in Step 3 say ABD and fold it through the vertex A so that
the two end points of the longest side meet exactly and mark the crease.
Unfold and cut along the crease and label the two parts as 1 & 2 [Fig. 1(b)].
Take the other cutout obtained in Step 3 and fold it in such a way that point containing a
right angle exactly falls on the mid point of its longest side.
Unfold and cut along the crease formed. Label the triangle cutouts as 3 [Fig. 1(c)].
Take the remaining cutout obtained in Step 6 and fold along the lines drawn. [Fig.1(d).]
Unfold and cut along the creases. Label the cutouts as 4, 5, 6 & 7. [Fig. 1(e).]
ACTIVITY 1
D B
Fig. 1(d)

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42
The seven shapes obtained represent a set of tangram pieces.
(i) Can you make a triangle using any 2 cutouts of a tangram? If yes, then write their numbers
........................................ .
(ii) Can you make a square using any 2 cutouts of a tangram? If yes, then write their numbers
........................................ .
(iii)Can you make a rectangle using any 2 cutouts of a tangram? If yes, then write their numbers
........................................ .
(iv)Can you make a triangle using any 3 cutouts of a tangram? If yes, then write their numbers
........................................ .
(v) Can you make a square using any 3 cutouts of a tangram? If yes, then write their numbers
........................................ .
(vi)Can you make a rectangle using any 3 cutouts of a tangram? If yes, then write their numbers
........................................ .
(i) Make a triangle, a square and a rectangle using only 2 pieces of the tangram cutouts.
(ii) Make a triangle, a square and a rectangle using only 3 pieces of the tangram cutouts.
Observations :
Extension :

55
43
To find the area of each part of a set of Tangram pieces by counting
number of complete squares and half squares.
Cut out Number of Number of Area Fraction
number complete squares half squares (a) (a/A)
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Observations:
To understand the method of finding the area of different geometrical
shapes.
Knowledge of tangram pieces and area.
An 8x8 grid, a pair of scissors, glue, a pen/pencil and paper sheet.
Take an 8x8 grid. Find its area (A) by counting the number of unit squares.
Draw a tangram on a 8x8 grid.
Count the number of complete and half unit squares in each shape.
Find the area of each shape by adding number of complete squares to half the number
of half squares.
1
2
3
4
5
6
7
(i) Do all shapes have equal area? Explore the relationship between the area of each shape to the
original square.
(ii) What fraction is the area of each shape to the original square.
ACTIVITY 2
2
1 5
4
3
7
6
D
C
A B
Fig. 2(f)

55
44
To make closed shapes using match sticks.
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Observation :
To understand closed and open figures.
Knowledge of closed figures.
Match-sticks or any other sticks of the same size.
Take two match sticks. Place them in different ways or positions, as shown in Fig. 3a.
Can you get a closed shape? .......................
Take three match sticks. Place them in different positions. Can you get a closed shape?
If yes, which shape is obtained? .......................
Observe different shapes obtained. Do you always get a closed shape?
.......................
Repeat the activity by taking 4 match sticks, 5 match sticks and 6 match sticks. Observe
in each case which of them is closed and which is open.
(i) How many, minimum number of match sticks are needed to get a closed shape? ................
(ii) How many minimum number of sticks are required to make a rectangle ? ...................
(iii)How many minimum number of sticks are required to make a square ? ...................
ACTIVITY 3
Fig. 3(a)

55
45
To identify a right angle, an angle less than a right angle and an angle more
than a right angle using body postures and to draw them using stick
drawings.
Pre-requisite :
Procedure :
Step 1.
Step 2.
Observation :
Extension :
To familiarize and differentiate between angles viz. a right angle, an angle
more than a right angle and an angle less than a right angle.
Knowledge of a right angle.
Aruler and coloured pens
Fold your one arm (see picture) Do you observe any angle?
Make body postures as shown in the picture making angles between body parts.
• Identify the right angles ....................
• Identify the angles less than a right angle ....................
• Identify the angles more than a right angle ....................
The activity may be extended to observing angles in different YogaAsana postures.
ACTIVITY 4 A

55
46
Write the word MATHEMATICS using line segments and observe the
number of right angles, number of angles more than a right angle and
number of angles less than a right angle.
Letter number Number of angles less Number of angles
of right angles than a right angle more than a right angle
Pre requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Observations :
Extension :
To differentiate between a right angle, an angel less than a right angle and
an angle more than a right angle.
Knowledge of a right angle.
Apaper, a ruler and coloured pens.
Write the word MATHEMATICS on a paper using a ruler.
Observe the angles in different alphabets.
Mark right angles, angles more than a right angle and angles less than a right angle with
different colours.
Fill your observations in the table given below :
M
A
T
H
E
I
C
S
You may take some other word and do the same activity.
ACTIVITY 4 B

55
47
12
Fig. 5a (4)
1
2
3
4
5
6
7
8
9
10
11
Fig. 5a (3)
Fig. 5a (2)
Fig. 5a (1)
To make the face of a clock by paper folding.
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Observation :
To develop the skill of dividing a circle into 12 equal parts.
Knowledge of the face of a clock.
Acircular cutout, a ruler and coloured pen, two needles of unequal size.
Take a circular cutout and fold it in two equal halves.[Fig. 5a(1)]
Fold yet again to divide the shape obtained in step 1 in two equal halves.[Fig. 5a(2)]
Make 2 folds in the shape obtained in step 2 such that it get divided into 3 equal halves.
[Fig. 5a(3)]
Unfold and draw lines on creases. Mark numbers 1 to 12 as on face of clock. [Fig. 5a(4)]
Fix two needle as shown in Fig 5a (5).
(i) What is the time shown in Fig. 5a (5)? ...........
1. Mark the position of hours needle at 3 and minutes needle at 1 and read the time
................
2. Mark the position of hours needle at 5 and minutes needle at 9 and read the time ..............
ACTIVITY 5 A
12
3
6
9
Fig. 5a (5)

55
48
To observe hands of a clock at different times in a day and record types of
angles formed in each case between the two hands.
Angle between the hands
Time Aright angle less than a right angle greater than a right angle
Pre-requisite :
Procedure:
Step 1.
Step 2.
Step 3.
Observation :
Complete the following table with your observations:
Extension :
To recognize angles equal to a right angle, less than a right angle and
greater than a right angle formed by the hands of a clock at different
times.
Reading a clock.
Aworking clock.
Take a clock.
Set the clock at 9:10, 9:30, 9:45 and 10:00
observe the smaller angle turned between the two hands.
9o'clock
9.10
9.30
9.45
10.00
You may set the clock at different times and find when the angle between the two
hands is :
(a) Aright angle
(b) Greater than a right angle
(c) Less than a right angle
12
3
6
9
Fig. 5b (1)
ACTIVITY 5 B

55
49
To make rectangles of different dimensions on a squared paper using 12
adjacent squares and calculate the perimeter and area of each of the
rectangles so formed.
Rectangle size Perimeter Area
Pre-requisite :
Procedure :
Step 1.
What shape do you get?
Step 2.
Step 3.
Step 4.
Observation :
Extension :
To understand that shapes having the same area may have different
perimeters.
Knowledge of perimeter and area.
Asquared paper, a pen and sketch pens.
Take a squared paper of dimension 12x8. Shade or colour twelve unit squares taking all
in one row. [Fig. 6(a)]
Make more rectangles of different dimensions by taking 12 such unit squares.
Find the area and perimeter of each rectangle, so formed.
Record your observations in a table.
Find the perimeter and area of each shape and record them in a table.
1 x12 ........................ ........................
2x6 ........................ ........................
3x4 ........................ ........................
Is there any difference in the perimeter of the three rectangles? ....................... (Yes/No)
Is there any difference in the area of the three rectangles? ....................... (Yes/No)
You may form different rectangles taking different number of squares and study the
change in perimeter, while the area remains the same.
ACTIVITY 6
Fig.6(a)

55
50
To calculate the perimeter of different shapes formed by shading six
adjacent squares of dimensions 1 cm each on a squared paper.
Figure No. Area Perimeter
Pre-requisite :
Procedure :
Step 1.
Step 2.
Observations :
Extension:
To verify that shapes having same area may have different perimeter.
Knowledge of perimeter and area of squares and rectangles.
Asquared paper and colours.
Take a squared paper and form different shapes using 6 unit squares as shown in
Fig. 7(a)
Find the perimeter and area of each shape and record them in a table.
1
2
3
4
5
(i) Does the area remain same in each shape? .................... (Yes/No)
(ii) Does the perimeter remain same in each shape? .................... (Yes/No)
(iii)What do you conclude? .............................
You may take 8 or 10 squares, get different shapes placing them adjacent to each
other in any order and find the change in perimeter while the area remains the same.
ACTIVITY 7
Fig. 7(a)
1
2 3 4
5

55
51
Fig. 8(c)
Fig. 8(b)
(a)To represent the fractions etc. using
rectangular strips of paper.
(b)To represent the fractions etc. of a circular region by paper
folding.
by paper folding
Pre-requisite :
Procedure : 8(a)
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Observation :
To understand fraction as a part of whole.
Knowledge of fractions.
A few paper strips of uniform width and circular cutouts of paper of same
size.
Take a paper strip (say 10 cm long approx). Fold it in the middle so that the two parts
overlap each other. Unfold and colour one part. Each part represents half of
of the whole strip. [Fig. 8(a)]
Take another strip and fold it as in Step 1 and again fold it in the middle so that the two
parts of the folded strip are exactly equal. Open the folds again.
Shade or colour one part. [Fig. 8(b)]
Take a strip and fold it in three equal parts, unfold it.
Shade/Colour one part [Fig. 8(c)]
Similarly take one more strip and fold it into 5 equal parts and shade one of the parts.
(i) Shaded/coloured part in Fig. 8(a) represents the fraction .....................
(ii) Shaded/coloured part in Fig 8(b) represents the fraction ......................
(iii) Shaded/coloured part in Fig 8(c) represents the fraction ......................
(iv) Shaded/coloured part in the figure obtained in Step 5 represents the fraction ................
1
2
1
3
1
4
1
5
, , ,
1
2
1
4
3
4
, , ,
1
2
1
3
3
4
3
5
, , , etc.
1
2
Fig. 8(a)
ACTIVITY 8

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52
Extension :
Procedure : 8(b)
Step 1.
Step 2.
Observation :
Extension :
(a) Try to represent the fractions and .
(b) Shade the parts to represent and .
Take a circular cutout of a paper.
Fold it in the middle so that the
two parts exactly overlap each
other. Unfold and mark the
crease. Shade or colour one part
Fig. 8(d).
Take another circular cutout. Fold
it as in Step 1 and again fold it to
get four equal parts. Shade or
colour one part
(i) Shaded/coloured part in Fig. 8(d) represents the fraction ..................
(ii) unshaded/uncoloured part in Fig. 8(d)represents the fraction .................
(iii)Shaded/coloured part in the figure obtained in the Step 2 represents the fraction .............
(iv)Unshaded/uncoloured part in the figure obtained in Step 2 represents the fraction ............
Try to represent th fraction , , .
1
8
1
10
2
3
2
5
, 2
8
Whole 1/2Half
1
3
2
3
1
5
Fig. 8(d)

55
53
To find the lines of symmetry in the following shapes by paper folding.
(i) Square
(ii)Rectangle.
To understand the idea of line symmetry and lines of symmetry.
Knowledge of lines of symmetry.
Coloured papers, a ruler and colored pens.
Cut a square of any dimension from a squared paper. Label it asABCD. [Fig 9(a)]
Fold the square cutout in such a way that BC falls onAD exactly.
Unfold the paper and draw a line on the crease. [Fig. 9(b)]. This is one line of symmetry
of the squareABCD. [Fig. 9(b)]
Again fold the square cutout in such a way thatAB falls on DC exactly.
Unfold the paper and draw a line on the crease.[ Fig. 9(c)]
This is also another line of symmetry of
the squareABCD.
Fold the square cutout along the
diagonalAC.
Unfold the paper and draw a line on
the crease.[ Fig. 9(d)]
This is also a line of symmetry of
squareABCD
Fold the square cutout along the
diagonal BD.
Unfold the paper and draw a line on the crease.[ Fig. 9(e)].
This is also one line of symmetry of squareABCD.
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
Step 8.
Step 9.
Fig. 9(a) Fig. 9(b)
D C
BA
D C
BA
ACTIVITY 9
Fig. 9(c)
D C
BA

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54
Fig. 9(e)
D C
BA
Fig. 9(d)
D C
BA
Step10.
Observation :
Repeat the activity using a rectangular cutout and find out the lines of symmetry?
1. How many lines of symmetry can be drawn in a square? .................
2. How many lines of symmetry can be drawn in a rectangle? ...................

55
55
Fig. 10(b) Fig. 10(c)
3
2 6
7
84
5 91
Fig. 10(e)
3
2 67
84
59 1
Fig. 10(d)
3
2 6
7
84
5 91
Fig. 10(a)
D C
BA
To make 3x3 magic square using numbers 1 to 9.
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
To make a magic square.
Knowledge of addition of numbers in rows, columns and diagonals.
Agrid paper, a ruler, a pencil and a colored pen.
On a grid paper draw a 3x3 square
ABCD. [Fig. 10(a)]
Extend the middle row and middle
column. [Fig. 10(b)]
Write numbers from 1 to 9
diagonally in boxes. [Fig. 10(c)]
Shift numbers written outside the
original (3x3) square to the empty
boxes as indicated by arrows.
[Fig. 10(d)]
Add the numbers row wise.
Observe the sum of each row.
ACTIVITY 10

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56
Step 6.
Step 7.
Observation :
Extension :
Add the numbers column wise.
Observe the sum of each column.
Add the numbers diagonally.
Observe the sum of each diagonal.
First Row
Second Row
Third Row
First Column
Second Column
Third Column
One Diagonal
Another Diagonal
The activity may be extended for making a 3x3 magic square for any 9 consecutive
numbers. You may try to make magic square of order 5x5 for 25 consecutive
numbers.
Location Numbers Sum of Numbers

55
57
To make cubes and cuboids of various dimensions using unit cubes
(i) A cuboid of dimensions 2 units x 3 units x 2 units
(ii) A cuboid of dimensions 3 units x 3 units x 2 units
(iii) A cube of side 3 units
Pre-requisite :
Procedure : (i)
Step 1.
Step 2.
Step 3.
To understand the concept of dimensions in solid shapes.
Knowledge of a cube and a cuboid.
Unit cubes.
Take 2 unit cubes and place them adjacent to each other as shown in Fig. 11(a).
Add 4 unit cubes to the previous shape as shown in Fig. 11(b).
Add 6 unit cubes on the top of previous layer of cubes as shown in Fig. 11(c).
ACTIVITY 11
Fig. 11 (a)

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58
Step 4
Observations :
Make cuboids and cubes of other dimensions as in (i), (ii) and (iii) and note observations
after every step.
Dimensions of shape obtained
After Step 1 = ……………..
Fig. 11 (b)
Fig. 11 (c)

66Grade : 6

66
61
(a) To verify that addition is commutative for whole numbers, by paper
cutting and pasting.
(b) To verify that multiplication is commutative for whole numbers, by
paper cutting and pasting
Pre requisite :
Procedure (a) : (a)
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Are they equal?
Step 6.
Observations:
To understand that addition as well as multiplication are commutative for
whole numbers.
(i) Knowledge of addition and multiplication of whole numbers.
(ii) Knowledge of commutative property of whole numbers.
Grid papers, a pair of
scissors and glue
To verify 3 + 4 = 4 + 3
Cut out two strips each of length 3
units from a grid paper and shade
them with any colour (say Red)
Fig. 1(a).
Cut two strips each of length 4 units
from a grid paper and shade them
with different colour (say Blue )
Fig. 1(b).
For representing 3 + 4, paste one
strip of length 3 units and then paste
another strip of length 4 units in the
same line on the grid paper without
leaving any gap Fig. 1(c).
For representing 4 + 3, paste one
strip of length 4 units and then paste
another strip of length 3 units in the
same on the same grid paper line
without leaving any gap Fig. 1(d).
Now, compare (by counting number
of boxes) the length of strips obtained in Step 3 and Step 4.
Repeat the activity for some more pairs of whole numbers and write your result.
Number of shaded boxes in the presentation of 3 + 4 = …………….
Number of shaded boxes in the presentation of 4 + 3 = …………….
ACTIVITY 1
Fig 1(d)
Fig 1(c)
Fig 1(a)
Fig 1(a)

66
Thus, 3 + 4 = 4 + 3
Hence addition is commutative for whole numbers.
To verify 3 x 4 = 4 x 3
Cutout three strips each of 4
boxes from a grid paper and
shade them with any colour (Say
blue).
Place them on a grid paper to
form a rectangle as shown in Fig.
1(d)
Now cutout 4 strips each of
length 3 units from the grid
paper. Colour them (say Red) and
place them on the same grid
paper to form a rectangle as
shown in Fig. 1(e)
Now compare the number of boxes in each of the two rectangles obtained. Are they
equal?
Repeat the activity for some more pairs of whole numbers and write your result.
Number of shaded unit squares in the representation of 3 x 4 = ……………
Number of shaded boxes in the representation of 4 x 3 = ……………
Thus , 3 x 4 = 4 x 3
Hence, multiplication is commutative for whole numbers.
Procedure (b):
Step 1
Step 2
Step 3
Step 4
Step 5
Observations:
62
Fig 1(e)
3x4 4x3

66
63
To find prime numbers between 1 to 100 by Eratosthenes Sieve's method.
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
Step 8.
Step 9.
To list prime numbers between 1 to 100.
Knowledge of factors and multiples.
Agrid paper / squared paper, sketch pens.
Take a grid paper/squared paper and cutout a 10 x 10 square from it.
Write numbers from 1 to 100 in this grid as shown in Fig. 2(a).
Colour the box with number 1 with any colour say blue as shown in Fig 2(a).
Now en circle the number 2 with green colour, as it is a prime number.
Next, cross all the multiples of 2 with red colour as shown in Fig. 2(b).
Next, encircle the number 3 (prime number) with green colour and cross all multiples of
3 by red colour as shown in Fig. 2(c)
Encircle the next prime number 5 with green colour and cross all it's multiples by red
colour.
Encircle the next prime number 7 with green colour and cross all it's multiples by red
colour.
Continue with this process till all the numbers are either encircled (prime numbers) or
crossed to obtain Eratosthenes sieve.
ACTIVITY 2

66
Fig. 2(c)

66
65
(a) To make a cube using the given net and count the number of faces,
vertices and edges.
(b) To check which of the given nets can be folded to form a cube.
Pre-requisite :
Procedure : (a)
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
To understand the formation of a cube and to identify its faces, vertices
and edges,
Knowledge of vertices, edges and faces of a solid object, knowledge of a
cube and its nets.
A set of given nets. Tracing paper, carbon papers, a thick paper, a pair of
scissors and glue.
Trace the given net Fig. 3(a) on a tracing paper.
Now copy this drawing on a thick paper using a carbon paper as shown in Fig. 3(b)
Cutout this net using a pair of scissors.
Fold it along the dotted lines.
Apply glue on its flaps to form a cube. Fig 3(c)
Fig 3(a)
Fig 3(b)
Thick
Paper
Carbon
Paper
Tracing
Paper
Fig 3(c)
ACTIVITY 3

66
Observations :
Procedure : (b)
Observations:
1. Number of faces = …………………
2. Shape of each face is …………………
3. Number of vertices = …………………
4. Number of edges = …………………
5. Length of each side of cube = …………………
Take one net out of the given nets Fig.3(d) and try to form a cube by following the above Steps 1
to 5. colour the nets which form a cube. Repeat the activity by taking other nets.
1. Which of the given nets can be folded to get a cube? ............................................
66
Fig 3(d)

66
67
To find the HCF of two given numbers, by paper cutting and pasting.
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
Observations :
Extension :
To understand the concept of HCF of two umbers.
Comparison of two numbers, knowledge of
Division algorithm : Dividend = Divisor x Quotient + Reminder
Coloured grid papers (2 different colours say green and red), a pair of
scissors, glue, a ruler, and a pencil.
Take any two numbers say 24 and
16.
Cut out a strip of length 24 units
using green colour grid paper as
shown in Fig.4(a).
Cut out another strip of length 16
units using red colour grid paper as
shown in Fig. 4(b).
Place the red strip along the green
strip as shown in the Fig. 4(c) and
cut out the remaining part of the
green strip.
Observe that the remaining part of
green strip cut out is of length 8
units and is smaller than the red
colour strip i.e. the strip of length
16 units.
Now place the smaller cut out strip
(green) along the larger cut out
strip (red) and cut out the extra
part (red strip) as shown in Fig.
4(d).
Repeat the activity till both strips
are equal.
(i) In Step 4, the length of the green strip = ............... units
(ii) In Step 6, the length of the red strip = ............... units
(iii)Is there any part of any strip left when green strip of length 8 units was placed on the red
strip?.......... Yes/No
HCF of 24 and 16 = ............
(i) Find the HCF of (i) 40 and 16, (ii) 12, 15 and 6.
ACTIVITY 4
Fig. 4(a)
Fig. 4(b)
Fig. 4(c)
24 cm
16 cm
Fig. 4(d)
8 cm
8 cm
Fig. 4(d)
8 cm

66
To classify the triangles on the basis of sides and angles from the given set
of triangles.
Pre-requisites :
Procedure :
Step 1.
Step 2.
Step 3.
To understand different types of triangles.
Knowledge of sides and angles of a triangle. Skill of measuring line
segment using a ruler and skill of measuring angles using a protractor.
A ruler, protractor and coloured pencils and a set of triangles of different
types.
On the basis ofAngles.
In the given set of triangles, measure all the angles of each triangle using a protector.
[Fig. 5(a)]
Mark all acute angles with yellow colour, all right angles with red colour and all obtuse
angles with green colour.
Complete the following Table 1.
68
D
E
F
G
H
B
C
Table 1
Triangle
Acute angles Right angles Obtuse angles
A 3 0 0
B
C
D
E
F
G
H
Number of Number of Number of
ACTIVITY 5
Fig. 5(a)

66
69
On the basis of sides
Triangle All three Only two None of the side
sides are equal sides are equal is equal
Step 4.
Step 5.
Table 2
Observations :
Measure length of each side of each triangle. [Fig. 5(a)]
Put a tick mark (ü)in the appropriate column in the following table.
A
B
C
D
E
F
G
H
In Table 1 and 2 :
1. Triangles having three acute angles are ………………………………. angled triangles.
2. Triangles having one right angle are ………………………………. angled triangles.
3. Triangles having one obtuse angle are ………………………………. angled triangles.
4. Triangles having three equal sides are ………………………………. triangles.
5. Triangles having two equal sides are ………………………………. triangles.
6. Triangles having all three sides of different lengths are ………………………………. triangles.
7. Triangles which are right angled as well as isosceles are ……………………………….
8. Is there any triangle which has two right angles? ……………………………….
9. Is there any equilateral triangle which is also right angled or obtuse angled? ………………….
10. Is there any equilateral triangle which is also right angled or obtuse angled?

66
To make the following shapes using a pair of set squares.
(i) square
(ii) rectangle
(iii) parallelogram
(iv) rhombus
(v) trapezium.
Handling set squares.
Knowledge of geometrical shapes.
Two pairs of set squares, pencil/pe and paper.
(i) Making a square shape.
Take two 45º -45º -90º set squares and place them on a paper such that their longest-
edges completely touch each other. [Fig. 6(a)]
Now mark the boundary of the shape by moving a pencil around the outer edges of the
set squares [Fig. 6(b)].
See carefully the shape formed. It is a square.
(ii) Making a rectangle
Take two 30º-60º-90º set squares and repeat the Steps 1, 2 and 3 mentioned above. Observe the
shape formed. [Fig. 6(b) and 6(d)]
Objective :
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Procedure :
70
ACTIVITY 6
0
45
0
30
Fig 6(a) Fig 6(c)
0
45
0
90
0
90
0
45
Fig 6(e)
0
30
Fig 6(b) Fig 6(d) Fig 6(f)

66
71
Procedure :
Step 1.
Step 2.
Procedures :
Step 1.
Step 2.
Step 3.
Procedure :
Step 1.
Step 2.
Step 3.
Observations:
(iii) Making a parallelogram
Take two 45º-45º -90º or 30º-60º-90º
set squares.
Place them such that 90º corner of the
one set square is in contact with 45º
corner of the other set square. [Fig
6(e)]
Mark the boundary and observe the
shape formed. [Fig. 6(f)]
(iv) Making a rhombus.
Take two 30º-60°-90º set squares and
place them to make an equililateral
triangle [Fig. 6(g)].
Make another equilateral triangle
with same base by the same process
opposite to first triangle as in [Fig.
6(h)].
Mark the boundary and observe the
shape so formed [Fig6(i)].
(v) Making a trapezium.
Make a rectangle using two identical
set squares.
Now place one more set squares of the
shape size in contact with one side of
the rectangle obtained [Fig. 6(j)].
Mark the boundary and identify the four sided shape so formed. [Fig. 6(k)]
(i) Shape formed in Fig. 6(b) is a ..........................
(ii) Shape formed in Fig. 6(d) is a ..........................
(iii) Shape formed in Fig. 6(f) is a ..........................
(iv) Shape formed in Fig. 6(i) is a ..........................
(v) Shape formed in Fig. 6(k) is a ..........................
(vi) No. of set squares used in making –
a square = …………………. a rhombus = ………………….
a trapezium = …………………. a parallelogram = ………………….
a rectangle = ………………….
Fig 6(g)
Fig 6(h)
0
30
0
30
Rectangle Fig 6(j)
Fig 6(i)
Rectangle Fig 6(k)

66
To make a prism and a pyramid using their nets and to find their number
of vertices, edges and faces.
Pre-requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
To visualise 3 dimensional shapes, namely, a prism on a triangular base
(triangular prism) and a pyramid on a triangular base (tetrahedron).
Knowledge of solid shapes specially a prism a pyramid knowledge of
verties, edges and faces of 3-D object.
Cut out of nets of a prism and a pyramid on triangular base, glue, pencil.
Take the cut out of the net shown in Fig. 7(a)and fold it along the dotted lines.
Apply gum on the flaps and join to give the shape shown in Fig. 7(b).
Count the number of vertices, edges and faces of this shape.
Take the cut out of the net shown in [Fig. 7(c)] and fold it along the dotted lines.
Follow again Steps 2 and 3 to obtian a 3-D object (triangular pyramid or tetrahendery) as
shown in Fig. 7(d).
Count the number of vertices, edges and faces of this shape.
72
Fig 7(c)
Fig 7(d)
Fig 7(a)
Observations :
(i) Solid obtained in Fig 7(b) is a prism with .................. base.
(ii) Solid obtained in Fig. 7(d) is a ............ with .......................... base.
(iii) Complete the following table.
Solid Number of Vertices Number of edges Number of faces
Triangular Prism
Triangular Pyramid
ACTIVITY 7
Fig 7(b)

66
73
To perform addition and subtraction of integers using different coloured
buttons/counters.
Prerequisite :
Procedure :
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
Step 8.
Step 9.
Step 10.
To understand the concepts of addition and subtraction of integers.
Familiarity with integers.
10 white buttons and 10 black buttons.
Assume a white button as (+1), a black button as (-1) and a pair of one white and one
black button as zero [Fig. 8(a)].
To find the sum of (+5) + (-2), take 5 white buttons and 2 black buttons and arrange them
in two rows as shown in the [Fig. 8(b)].
Match one white button with one black buttons as shown in Fig. 8(c).
Every pair of one white and one
black button makes zero. Count
the remaining buttons and note
down their colour. If remaining
buttons are white, answer is a
positive integer. If remaining
buttons are black, answer is a
negative integer.
To find the value of (+4) + (-6),
take 4 white buttons and 6 black
buttons. [Fig. 8(d)].
Follow the Steps 2 to 4. [Fig. 8(e)]
To find the value of (+5) – (+2),
take five white buttons and 2
black bottons. [Since +2 is to be
subtracted] and place them in 2
rows as shown in Fig. 8(f).
To subtract +2 means adding -2
i.e. 2 buttons of black colour.
Match the button of two colours
[Fig. 8(g)]
Count the remaining buttons and
note their colour.
To find the value of (+4) – (+5)
take four white buttons and 5
black buttons. Arrange them in
rows as shown in Fig. 8(h). Match
the buttons of two colours.
Fig 8(a)
= +1
= -1
= 0
(+5) + (-2)
Fig 8(b)
Fig 8(c)
(+5) + (-2)
= 0 + 3 = 3
(+4) + (-6)
= 0 + -2 = -2
Fig 8(d)
(+4) + (-6) = 0 + (-2) = -2
Fig 8(e)
Fig 8(f)
ACTIVITY 8

66
Step 11.
Observations:
To find value of (+4) – (-5), take four white buttons and 5 white buttons and place them
in 2 rows as shown in Fig. 8(i). Count the number of buttons and their colour.
(i) In Step (4), the number of remaining buttons = ...................
Their colour is ................
So, (+5) + (-2) = ...................
(ii) In Step 6, the number remaining buttons = ..................
Their colour is ..................
So, (+4) + (-6) = .....................
(iii) In Step 8, the number of remaining buttons = .................
Their colour is ...................
So, (+5) - (+2) = ...................
(iv) (+4) - (+5) = ....................
(v) (+4) - (-5) = ...................
74
Fig 8(g) Fig 8(h)
Fig 8(i)

66
75
To represent decimal numbers 0.25, 0.5, 0.75, 0.68 etc. using a 10x10 grid.
Can you represent 0.25 in some other way on a 10x10 grid?
Pre requisite :
Procedure :
Step 1.
Step 2.
Step 3.
Observations :
To understand decimals.
Knowledge of of fractions and decimals.
Grid paper and coloured pens.
Take a 10x10 grid and shade 25 unit squares. The shaded portion represents 25/100 i.e.
0.25 [Fig. 9(a)].
To represent 0.5 means to represent 0.50. Take a 10 x 10 grid and shade 50 unit squares.
The shaded portion represents 50/100 i.e. 0.50 or 0.5 [Fig. 9(b)].
Try to represent other decimal numbers.
(i) The number of unit squares in the grid in Fig. 9(a) = .............
(ii) The number of unit squares shaded in Fig. 9(a) = ..............
(iii)The shaded portion in Fig. 9(a) represents the decimal ..............
(iv)The shaded portion in Fig. 9(b) represents the decimal ..............
Fig. 9(a) Fig. 9(b)
ACTIVITY 9

66
Group Activity
(a)To find the areas of palm impressions on a grid paper of each group
member, by counting the squares.
(b)To represent the data so obtained by means of a bar graph.
Pre-requisite :
Procedure :
Step 1.
(1) To find approximate area of irregular shapes.
(2) To represent the given data through bar graph.
Concept of area, representation of data through a bar graph.
Asquared grid paper, coloured pencil, a pencil/pen and graph paper.
(A)
Each member of a group of students places the palm of his/her right hand on the
squared grid paper, then moves the pencil around his/her palm to trace the boundary.
[Fig. 10(a)].
76
Fig 10(a)
A
C
B
ACTIVITY 10

66
Fig 10(b)
77
Step 2.
Step 3.
Procedure : (b)
Step 4.
Step 5.
Count the number of squares enclosed in the boundary by taking half as half, more than
half as 1 and leaving the others (i.e less than half).
Each group member records the data in the following table. Number of squares inside
the palm impression is the area of the palm impression.
1 110 110
2
3
4
5
Take a graph paper. Draw two lines, one horizontal and one vertical as shown in
Fig.10(b).
Along the horizontal line, write the names of students at equal distances as shown in
Fig. 10(c)
Group Member Number of squares Area in square units
(half or more than half)
Fig 10(c)
Y
X
50
60
70
40
30
20
10
0
Name1
Name2
Name3
Name4
Name5
80
90
100
110
120
X

66
Step 6.
Step 7.
Step 8.
Observations:
Extension :
Along the vertical line, write numbers from 0 till 120 at equal distances as shown in
[Fig. 10(c)]
Let us consider Name 1 and let the area of his/her palm impression is 60 squares. On
name 1, draw the bar of height 60 [Fig. 10(d)].
Similarly, draw the bar corresponding to the data obtained for other group members.
(i) Which member of the group has the maximum palm area ? ....................
(ii) Which member of the group has the minimum palm area? .....................
(iii)Which of the group members have the same palm area? .......................
1. The activity can be used to find the area of any irregular shape. Draw and trace different
shapes and find their areas.
2. Collect different types of data, for example, total number of students in each class (may be
from VI to VIII) or different sections of a class; number of scores obtained by different houses
in a school activity, etc. Represent the data in the form of bar graph.
78
Fig 10(d)
Y
X
50
60
70
40
30
20
10
0
Name2
Name3
Name4
Name5
80
90
100
110
120
Name1

66
79
To determine the number of lines of symmetry of following shapes by
paper folding -
(a)equilateral triangle (b) isosceles triangle
(c) square (d) rectangle
(e) rhombus
Pre-requisite :
Procedure:
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
To understand line symmetry of plane figures and draw their lines of
symmetry.
Knowledge of line symmetry of plane figures.
Cutouts of the geometrical figures, equilateral triangle, isosceles triangle
square, rectangle and rhombus.
Take a cutout of an equilateral triangle. Fold it through a vertese so that the two parts of
the triangle cover each other exactly, Fig 11(a).
Unfold and mark the crease or the line of fold. The triangle is said to have a symmetry
called line symmetry. This line of fold is called a line of symmetry of the triangle.
Fold the triangle again in the same way through other two vertices Fig. 11(b) to get two
more lines of symmetry.
Now take a cutout of an isosceles triangle and follow Steps 1 and 2 above. Mark the line of
symmetry, if any.
Repeat the activity by taking cut out of a square, a rectangle and a rhombus. Mark lines of
symmetry in each case, if any.
ACTIVITY 11
Fig 11(a) Fig 11(b)

66
Observations :
Extension :
Complete the following table :
Equilateral triangle 3
Isosceles triangle ............................
Square ............................
Rectangle ............................
Rhombus ............................
Taking cutouts of some other plane figures, try to find lines of symmetry, if they have
any.
Figure Lines of Symmetry Number of Lines of Symmetry
80

66To collect the data from the students regarding time spent (more than 2 hours)
in watching T.V. and to present the data in the form of a bar graph by paper
cutting and pasting.
Name of student Number of hours spent in watching TV
Name of student Number of hours (more than 2) spent
in watching TV
Pre-requisite :
Procedure :
Step 1.
Table 1
Step 2.
Table 2
Step 3.
Step 4.
Step 5.
To collect data and to represent data in the form of a bar graph.
Knowledge of drawing a bar graph
Coloured and white papers, sketch pens, a pair of scissors, a pencil and
glue.
Record the number of hours spent by each student in the class during a day in watching
TV in Table 1.
List the student who spent more than 2 hours a day in watching TV in Table 2.
To make a bar graph of the data in Table 2, draw two lines (one horizontal and one
vertical as shown in Fig. 12(a).
Write the names of the students in Table 2 along the horizontal line at equal distances
and time spent (in hours) along the vertical line. [Fig. 12(b)]
Now make strips of uniform width of different colours, for each students, of length
according to time (in hour) spent by him/her in watching TV (see Table 2).
ACTIVITY 12
81

66
Step 6.
Observations :
Extension :
Paste these strips in Fig. 12(b) accordingly against the names of the students.
(i) The numbers of students who spent 2 to 3 hours in watching TV a day = .......................
(ii) The name(s) of students who spent more than 6 hours a day watching TV are ....................
(iii)The name(s) of the student(s) who spent maximum time in watching TV are .....................
(iv)The name(s) of the student(s) who spent exactly 2 hours a day in watching TV is/are ...........
Collect the data for other activities such as time spent in doing homework (in a week)
by each student of your class and draw a bar graph for the data.
82
Fig. 12(a)
Name of students
Fig. 12(b)
Timespent(inhour)
Name1
Name2
Name3
Name4

Cbse maths activity class_3_8_part2

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