Fractions lesson3 4

Fractions Lesson 3
Understanding equivalent
fractions

MALT©2006 Maths/Fractions Slide Show : Lesson 3

These numbers are called

fractions
1
2 3 12
15 2 22
3
5 4
6 7

Here are some

mixed numbers
2 1
5 4
9

3
3 2
5

1 6
8
2 1
4


Today’s lesson looks at

Equivalent
fractions

6 3
8 4

WALT : to understand equivalent
fractions and decide if fractions
are equal

6 3
8 4

In the word equivalent
there is the root word
equal

6 3
8 4

Fractions which are said to be
equivalent are equal to each
other.

6 3
8 4

For example

2 1
4 2


So if you were given 2 quarters of
a cake and your friend was given
half a cake would you both have
the same amount?
2 1
4 2


Yes!
These fractions are equal.

These are equivalent fractions.
2 1
4 2


Can you tell if the following
fractions are equal?
Are they equivalent fractions?

3 1
6 2


Yes these fractions are equal.
They are equivalent fractions.

3 1
6 2



4 2
6 3


Yes they are
equivalent fractions.

4 2
6 3



3 1
12 4


Yes they are
equivalent fractions.

3 1
12 4



2 1
5 3


No, they are not equal.
They are not equivalent fractions.

2 1
5 3


Here are some equivalent
fractions.
Can you work out a strategy for
deciding whether they are equal?

2 1
8 4

fractions.

4 2
10 5

fractions.

3 1
9 3

Use thinking time to discuss.

1 3
4 12

Use thinking time to discuss.

5 1
10 2

What ideas have you come up
with?

5 1
10 2

Explain your
strategy to the class.

5 1
10 2

There is a relationship between
the fractions using dividing and
multiplying.

5 1
20 4

What ever you do to the
top number . . You must
do to the bottom number.

5 1
20 4

What ever you do to the top number . .
You must do to the bottom number.

divide by 5

5 1
20 5
divide by 5



divide by 2

2 1
4 2
divide by 2



divide by 3

3 1
12 4
divide by 3



divide by 4

4 1
20 5
divide by 4



divide by 2

2 1
8 4
divide by 2



multiply by 3

3 9
5 15
multiply by 3



multiply by 2

2 4
9 18
multiply by 2


What is the missing number?

1
5 10



4
8 4



32 4
40


Well done

32 4
40 5


Sometimes you might need to work out
equivalent fractions in
three steps.

48 6 3
64 8 4


Follow up task
H7 Textbook
Page 38
Questions 1,2,3

Answers


End of this lesson,
any questions or
comments?


Fractions lesson3 4

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Fractions lesson3 4