Q3-W7-MATH 5.pptxfor powerpoint 5 math measuring time using 2 hour clock

MATHEMATICS 5
QUARTER 3 WEEK 7
D
A
Y
1
Measures Time Using 12-
Hour clock

Look at the picture below;
What is in the
picture?
Answer: It is a
clock (Wall Clock)
What is the use of
clock?
Answer: It is use to
look for time.

Do you have clock at home?
When do you usually use
clock?
Answer: We can use it to
monitor time to cook food, if it
is time for lunch or dinner.

Watch the short video using the link below:
https://www.youtube.com/watch?v=K5
q65e_E-os

Two ways to show time
1. 12- hour clock
12-hour clock format
uses numbers 1 to 12 and
uses a.m. denoting
morning and p.m.
denoting afternoon.

2. 24- hour clock.
24-hour clock uses
numbers 1 to 24 and instead of
using a.m./ p.m. at the ends of
time, H (hour) is placed. A 24-
hour clock is also called a
Military Clock.

Discovery Learning Approach
Identify and paste the time
cut-outs below whether
the following time is 12-
hour format or 24-hour
format. (On the Board)

12-Hour Clock 24-Hour Clock
11:00
A.M.
5:00
A.M.
9:00
A.M.
1100
hours
0500
hours
0900
hours

Converting 12-hour clock to 24-
hour clock:
For the first hour of the day (12:00
midnight to 12:59 AM), subtract 12 hours.
Example: 12:15 AM
12:15 – 12 = 0015 hours

From 1:00 AM to 12:59 PM,
no change. Just put 0 before
the first digit.
Example: 2: 59 AM
0259 hours or 0259 H

From 1:00 PM to 11:59 PM,
add 12 hours.
Example: 3:45 PM
3:45 + 12:00
=15:45 / 1545 hours

Military time read and spoken to
four digits. A leading 0 is read or
spoken for the first 12 hours of the
day. On radio and for maximum
clarity, every digit is spoken. When
reading or in casual conversation,
times can be read as three- or
four-digit numbers:

0100 – One a.m. is "Zero one hundred hours."
0630 – 6:30 a.m. is "Zero six-thirty," or (better) "Zero
six-three-zero."
1045 – 10:45 a.m. is read or spoken as "Ten hundred
forty-five" or "Ten hundred four-five."
1159 – A minute before noon is "Eleven hundred fifty-
nine" or "Eleven hundred five-niner."

Directions: Fill in the
table by converting a12-
hour clock into a 24-hour
clock. Write the answer
on your answer sheet.
Developing Mastery

2024 hours
0957 hours
1300 hours
0250 hours
1710 hours

On what time do you usually wake up in
the morning?
Why must wake up early?
During Saturday, do you wake up early to
help your mom doing the house chores or
you just keep on holding your phone and
playing?

How to convert time from 12-hour clock to
24-hour clock?
Answer:
For the first hour of the day (12:00 midnight
to 12:59 AM), subtract 12 hours.
From 1:00 AM to 12:59 PM, no change.
From 1:00 PM to 11:59 PM, add 12 hours

Directions: Answer the following
questions. Write the answer on your
answer sheet.
1. What is 2:50 am on a 24-hour clock?
A.0250 hours C. 450 hours
B.0350 hours D. 654 hours
2. What is 9:16 pm on a 24-hour clock?
C.3112 hours C. 4116 hours
D.2116 hours D. 5126 hours
Evaluation:

3. Convert 7:45 am to 24-hour clock.
A.0845 hours C. 0745 hours
B.0954 hours D. 0104 hours
4. 3:45 pm convert to 24-hour clock is ________________.
C.1545 hours C. 1553 hours
D.1342 hours D. 1646 hours
5. 12:35 am convert to 24-hour clock is _______________.
E.0045 hours C. oo65 hours
F.0035 hours D. 0075 hours

Answer Key:
1. A
2. B
3. C
4. A
5. B

MATHEMATICS 5
QUARTER 3 WEEK 7
D
A
Y
2
Measures Time Using
24-Hour clock

Directions: Fill in the
table by converting a12-
hour clock into a 24-hour
clock. Write the answer
on your answer sheet.
Review:

The 12-hour and 24-hour clocks are
both written in the format:
Hours: Minutes
The 12-hour clock uses the
abbreviations a.m. and p.m. after the
time.
The 24-hour clock does not have a.m.
and p.m.. It uses H for hours.

Ante meridiem (a.m., A.M., AM)
means this time is from midnight until
morning before noon, that is, 12:00
a.m. to 11:59 a.m.
Post meridiem (p.m., P.M., PM) means
this time is the afternoon before
midnight, that is, 12:01 noon to 11:59
p.m.

24- hour clock.
24-hour clock uses
numbers 1 to 24 and instead
of using a.m./ p.m. at the ends
of time, H (hour) is placed. A
24- hour clock is also called a
Military Clock.

Changing 24-hour clock to 12-hour
clock
The following simple steps will help you
change a 24-hour time to a 12-hour time
with 'a.m.' and 'p.m.'.
 If the hour is exactly 12, simply annex
p.m. to the time.

 If the hour is 00, change it to 12 and
annex a.m. to the time.
 If the hour is greater than 12, simply
subtract 12 from the hour and annex
p.m. to the time.
 If the hour is less than 12, simply annex
a.m. to the time and take away any
leading zeros.

Note: The minutes and seconds never
change when changing between 24
hour and 12-hour times.
Examples
1. Change 14:36 to 12-hour format.
Solution: Subtract 12 from 14 and
annex p.m. to the time, thus
14:36 – 12 = 2:36 p.m.

Solution: Change 00 to 12 and annex
a.m. to the time, thus
00:45 = 12:45 a.m.
Solution: Subtract 12 from 20 and
annex p.m. to the time, thus
20:36 – 12 = 8:36 p.m.

Solution: Simply annex a.m. to the time
and take away the zero before the
hour 2.
02:12 = 2:12 a.m.

Change Me
Directions: Change the 24-hour clock times to
12-hour clock times.

How will you value your
time?
How o convert time from 24-hour
clock to 12 hour clock?

Directions: Choose the letter of
the correct answer.
1. How will you express 08:40
hours military time in 12-hour
time?
A. 6:40 p.m. B. 8:40 a.m.
C. 8:40 p.m. D. 8:40 H

2. How many hours are there in 2
days?
A. 24 B. 36 C. 44 D.48
3. Office hours usually starts at 8
a.m. What is this time in a 12-hour
format?
A. 8:00 a.m. B. 08:00 H
C. 20:00 p.m. D. 20:00 H

4. How will you express 08:40
hours military time in 12-hour
time?
A. 6:40 p.m. B. 8:40 a.m.
C. 8:40 p.m. D. 8:40 H

5. How many days are there
in 48 hours?
A. 7 C. 5
B. 2 D. 3

MATHEMATICS 5
QUARTER 3 WEEK 7
D
A
Y
3
Calculating Time in Different
World Time Zones

Review:
Directions: Change the 24-hour clock times to
12-hour clock times.

Look at the picture below.
What is in the picture?

(AP Integration)
How many continents do we have?
What are those?
Do we have the same time from other
continents?

Study the clocks below
Are the
following clock
show same
time?

In October 13, 1884, U.S. President
Chester Alan Arthur convened the
International Meridian Conference in
Washington. It was attended by 41
delegates from 25 nations. The
conference established that the
meridian passing through the Royal
Observatory at Greenwich would be the
world's Prime Meridian.

All longitude lines would be
measured both east and west
from it up to180 degrees. The
conference also established
Greenwich Mean Time as a
standard for astronomy and
setting time zones.

A time zone is a region of the globe
that observes a uniform standard
time for legal, commercial and
social purposes. Time zones tend to
follow the boundaries of countries
and their subdivisions instead of
strictly following longitude. Below is a
time zone map showing an example
of the way time zones are divided.

Different times at different places in the
world are caused by the movement of the
Earth, 15 degrees longitude every hour.
Since there are 24 hours in a day, there are
24 standard time zones. Note that 24 hours x
15○ = 360○. Time zones are counted from the
Prime Meridian or at 0○ longitude. Each time
zone is counted at 15○ intervals and extends
7½o to the left and to the right of a central
meridian.

For example, if it is 11:25 p.m. in
the Philippines, it is also 11:25 p.m.
in the places 7½o to the left and
right of the Philippines. If it is 8:25
a.m. in Los Angeles, it is also 8:25
a.m. in the places 7½o to the left
and to the right of Los Angeles.

Suppose today is Friday and the
time is 11:25 p.m. (23:15 H) in Cebu
City. It is also Friday in New York City
but the time is 11:25 a.m. In another
time zone, it is Saturday, 00:25 H, in
Tokyo, Japan, while in Los Angeles,
California it is still Friday, 8:25 a.m.
Why is this so? Study the clocks
below.

To see the relationship of time in
certain places to the time in the
Philippines, take a look at the table
below and note that (+) means
ahead and (-) means behind. Use
this table in identifying the time in a
particular place as how it is related
to the time in our country.

My Time Is Precious!
Directions: For each given
time in the Philippines,
determine the equivalent
time in the given country.
Express your answer both in
12-hour and 24-hour clock
Formats

Directions: Read the problem carefully. Answer
the questions that follow.
Tony lives in Japan. His brother Andrei lives in the
Philippines. Their grandmother is in India and
wants both boys to call her at 2 p.m. in Japan
and Philippines times.
a. What time in India will Tony call?
b. What time in India will Andrei call?

How to see the
relationship of the
Philippine time to
other country?

Directions: Choose the letter that
corresponds to the correct answer. For your
solutions you can use an extra sheet of
paper. A score of 10 is excellent, 8-9 is very
good, and a score of 5-7 is good.
1. On which of the following do the times at
different places on earth depend?
A. Imaginary lines
B. Lines of Latitude
C. Lines of Longitude
D. International Date Line

2. Before the 19th century, which
inspired the standard for clocks?
A. Planets C. Sun and star
B. Constellation D. Prime Meridian
3. Which of the following shows the
time of midnight in a 24-hour clock?
A. 12:00 a.m. C. 24:00 H
B. 12:00 H D. 0:00 H

4. How wide in degrees is each time zone?
A. 12 C. 24
B. 15 D. 180
5. What occurred on October 13, 1884 in
Washington D.C., USA?
A. Time Zone Meeting
B. Greenwich Meridian
C. International Meridian Conference
D. nternational Time

MATHEMATICS 5
QUARTER 3 WEEK 7
D
A
Y
4
Solving Problems
Involving Time

Review:
My Time Is Precious!
Directions: For each given time in the
Philippines, determine the equivalent
time in the given country. Express
your answer both in 12-hour and 24-
hour clock Formats

Read the problem below.
Your sister works as a nurse in one of the
hospitals in Sydney, Australia. She is a front liner
treating COVID-19 patients, since the
pandemic started. She calls every 7:00 p.m. in
the Philippines to check if your parents and
other siblings are all okay.
Imagine that you are living in Sydney with your
sister. What time is it in Sydney when your sister
makes these calls?

Our lesson for
today is about
solving problems
involving time.

Let’s consider the given problem using the
following steps.
Your sister works as a nurse in one of the hospitals in
Sydney, Australia. She is a front liner treating
COVID-19 patients since the pandemic started.
She calls every 7:00 p.m. in the Philippines to check
if your parents and other siblings are all okay.
Imagine that you are living in Sydney with your
sister. What time is it in Sydney when your sister
makes these calls?

Understand:
a. What is asked?
We need to know the time in Sydney
when it is 7:00 p.m. here in the
Philippines.
b. What are the given facts?
The time in the Philippines is 3 hours
behind that of Sydney. Your sister calls
every 7:00 p.m. in the Philippines.

Plan:
Add 3 hours to 7:00 p.m.
Solve:
Simply, add 3 + 7 = 10. Therefore,
the time in Sydney is 10:00 p.m.
when it is 7:00 p.m. here in the
Philippines.

Another Example:
Maria is a public school teacher in
Calbayog City. For extra income, she
teaches language and communication
subjects online. Her clients are mostly
non-English speaking students based in
Japan. What time should she go online if
her first session starts at 8:00 p. m. in
Japan?

Understand:
a. What is asked?
What time it is in the Philippines when it is
8:00 p. m. in Japan
b. Given facts:
Japan’s time is 1 hour ahead of the
Philippines. Maria needs to go online at
8:00 p.m. in Japan.

Plan:
Subtract 1 hour to 8:00 p.m.
Solve:
8 - 1 = 7. Therefore, Maria goes
online for her class when it is
7:00 p.m. here in the
Philippines.

Another Problem:
Jhune wants to help the Calbayog
City front liners by providing them
with snacks. He prepares a snack
combo of special spaghetti and
kakanin for 60 persons. How many
minutes will it take to prepare 60
snacks combos if it takes 50 seconds
to pack each one?

We follow this four-step plan.
1. Understand by identifying what is being
asked in the problem and the relevant
facts stated.
2. Plan by choosing a strategy to solve the
problem, either by using variable,
equation and a model. Identifying the
operation to be used as signaled by clue
or key words stated in the problem.

3. Solve by performing the
identified strategy or tool to solve
the problem; and
4. Check the process by verifying
the reasonableness of the answer.
State the answer in sentence form.

Answer: It will take 50
minutes to finish packing
the snack combos.

Directions: Read and understand
the problem below. Choose the
letter of the correct answer.
The four classes started their
lessons at 6:45 a.m. If they stayed
in class for 5 hours, what time did
they finish?

1. What is asked?
A. The time they started
B. The time they stayed in class
C. The lessons they had with the time
D. The time they finished their lessons
2. What operation shall we use to solve the
problem?
A. Addition
B. Subtraction
C. Division
D. Multiplication

3. If n is the unknown, what is the correct
number sentence?
A. 6:45 + 5:00 = n
B. 6:45 x 5:00 = n
C. 6:45 – 5:00 = n
D. 6:45 + 5 + 4 = n
4. Which of the following is the answer to the
problem?
A. 1:45 am
B. 11:45 am
C. 11:50 am
D. 11:45 pm

What are the
following steps
you have applied
in solving the
problems?

MATHEMATICS 5
QUARTER 3 WEEK 7
D
A
Y
5
Catch-Up Friday

Q3-W7-MATH 5.pptxfor powerpoint 5 math measuring time using 2 hour clock

More Related Content

What's hot (20)

Similar to Q3-W7-MATH 5.pptxfor powerpoint 5 math measuring time using 2 hour clock (20)

More from ERMINIODELACRUZ (19)

Recently uploaded (20)

Q3-W7-MATH 5.pptxfor powerpoint 5 math measuring time using 2 hour clock