chevron icon chevron icon chevron icon

Conversion Of Time

In this article, we will be learning about the conversion of time and the 24-hour clock. The lesson objectives are: 

  1. Conversion of time
  2. 24-hour clock format

Watch Our Video Lesson!

Topic Recap:

Conversion of Time

We can express time in hours and minutes to minutes. 

Example 1: 

  1. \(1 \text{ h } = 60 \text{ min}\)
  2. \(\begin{align}\\ 2 \text{ h }  &= 2 \times 60 \text{ min}\\        &= 120 \text{ min} \end{align}\)
  1. \(\begin{align}\\ 3 \text{ h } 20 \text{ min } &= 180 \text{ min }+ 20 \text{ min }\\ &= 200 \text{ min } \end{align}\)

We can also express time in minutes to hours and minutes.

 

Example 2: 

  1. \(180 \text{ min } = 3 \text{ h } 0 \text{ min }\)
  2. \(\begin{align}\\ 400 \text{ min } &= 360 \text{ min }+ 40 \text{ min }\\                          &= 6 \text{ h } 40 \text{ min } \end{align}\)

 

1. Conversion Of Time

\(1 \text{ minute } = 60 \text{ seconds}\)

To express time from minutes to seconds, we multiply the number of minutes by 60. 

To express time from seconds to minutes, we divide the number of seconds by 60. 

\(1 \text{ hour} = 60 \text{ minutes}\)

To express from hours to minutes, we multiply the number of hours by 60. 

To express from minutes to hours, we divide the number of minutes by 60. 

 

Question 1: 

Express the following time in seconds.

  1. \(\displaystyle{2} \text{ min} =\) __________ s
  2. \(\displaystyle{2} \text{ h} =\) __________ s
  3. \(\displaystyle{\frac {1}{4}} \text{ h} =\) __________ s

Solution: 

A. \(\begin{align}\\ 2 \text{ min } &= 2 \times 60\\ &= 120 \text{ s} \end{align}\)

Answer:

120 s

B. \(\begin{align}\\[2ex] 2 \text{ h } &= 2 \times 60\\       &= 120 \times 60\\        &= 7200 \text{ s} \end{align}\)

Answer:

7200 s

 

C. \(\displaystyle{\frac {1}{4} \text{ h}}\)

\(\because\)   \(1 \text{ h}\) = 60 min

\(\therefore\)   \(\displaystyle{\frac {1}{4} \text{ h}}\) = 60 min ÷ 4 = 15 min

\(\therefore\)   15 min = 15 × 60 s = 900 s

Answer:

900 s

 

Question 2: 

Express the following time in seconds.

5 min = __________ s

Solution:

5 min = 5 × 60 s

          = 300 s

Answer:

300 s

 

Question 3: 

Express the following time in seconds.

45 min = __________ s

Solution:

45 min = 45 × 60 s

            = 45 × 6 × 10

            = 2700 s

Answer:

2700 s

 

Question 4: 

Express the following time in seconds.

\(1\frac {1}{2}\) h = __________ s

Solution:

1 h = 3600 s

\(\frac {1}{2}\)= 30 min

     = 30 × 60

     = 1800 s

 

\(1\frac {1}{2}\)= 3600 s + 1800 s

         = 5400 s 

Answer:

5400 s

 

Question 5: 

Express the following time in minutes or hours and minutes. 

  1. 180 s = __________ min
  2. 3000 s = __________ min
  3. 4500 s = __________ h __________ min 

Solution: 

  1. 180 s = 180 ÷ 60 

             = 3 min

Answer:

3 min

 

  1. 3000 s = 3000 ÷ 60 

               = 50 min

Answer:

50 min

 

  1. 4500 s = 4500 ÷ 60 

               = 75 min

               = 1 h 15 min

 

OR

 

                    1 h = 3600s

4500 s - 3600 s = 900 s

                          = 900 ÷ 60 

                          = 15 min

 

Hence, 4500 s = 1 h 15 min       

Answer:

1 h 15 min

 

Question 6: 

Express the following time in minutes or hours and minutes. 

120 s = __________ min

Solution: 

120 s 

= 120 ÷ 60 

= 2 min

Answer:

2 min

 

Question 7: 

Express the following time in minutes or hours and minutes. 

300 s = ___________ min

Solution: 

300 s 

= 300 ÷ 60 

= 5 min

Answer:

5 min

 

2. 24-Hour Clock Format

In the 24-hour clock, there is no need to add suffixes like am or pm. It is written in 4 digits, where the first two digits represent the hour and the last two digits represent the minutes. 

 

Time from midnight to noon: 

12-h clock = 12:00 am to 11:59 am

24-h clock = 00 00 to 11 59

 

Time from noon to midnight:

12-h clock = 12:00 pm to 11:59 pm

24-h clock = 12 00 to 23 59

 

Example:

12-h clock 

24-h clock

5:30 am

05:30

5:30 pm

17:30 

10:30 am

10:30

10:30 pm

22:30

12:00 pm

12:00

12:00 am

00:00

 

Question 1: 

Express the following time in 24-hour clock.

  1. 8:50 am = __________
  2. 12:20 am = __________
  3. 9:10 pm = __________

Solution: 

a) 8:50 am = 08 50

Answer:

08 50

 

b) 12:20 am = 00 20

Answer:

00 20

 

c) 9:10 pm = 21 10 

Answer:

21 10

 

Question 2: 

Express the following time in 24-hour clock.

2:35 am = __________

Solution: 

2:35 am = 02 35

Answer: 

02 35

 

Question 3: 

Express the following time in 24-hour clock.

11:15 pm = __________

Solution: 

11:15 pm = 23 15 

Answer:

23 15

 

Question 4: 

Which of the following clocks shows the time 19:15?

 

Solution: 

19 15 is 7:15 pm in the evening. 

Answer:

(4)

 

Question 5: 

Express the following time in 12-hour clock.

  1. 03 30 = __________
  2. 12 50 = __________
  3. 17 45 = __________

Solution: 

  1.  03 30 = 3:30 am
  2. 12 50 = 12:50 pm
  3. 17 45 = 5:45 pm

 

Question 6: 

Express the following time in 12-hour clock.

00 10 = __________

Solution: 

00 10 = 12:10 am

Answer:

12:10 am

 

Question 7: 

Express the following time in 12-hour clock.

20 15 = __________

Solution: 

20 15 = 8:15 pm 

Answer:

8:15 pm


 

Continue Learning
Multiplication Whole Numbers
Multiplication And Division Decimals
Model Drawing Strategy Division
Fractions Factors And Multiples
Area And Perimeter 1 Line Graphs
Time  

 

Resources - Academic Topics
icon expand icon collapse Primary
icon expand icon collapse Secondary
icon expand icon collapse
Book a free product demo
Suitable for primary & secondary
select dropdown icon
Our Education Consultants will get in touch with you to offer your child a complimentary Strength Analysis.
Book a free product demo
Suitable for primary & secondary
icon close
Default Wrong Input
Get instant access to
our educational content
Start practising and learning.
No Error
arrow down arrow down
No Error
*By submitting your phone number, we have
your permission to contact you regarding
Geniebook. See our Privacy Policy.
Success
Let’s get learning!
Download our educational
resources now.
icon close
Error
Error
Oops! Something went wrong.
Let’s refresh the page!
Geniebook CTA Illustration Geniebook CTA Illustration
Turn your child's weaknesses into strengths
Geniebook CTA Illustration Geniebook CTA Illustration
close icon
close icon
Turn your child's weaknesses into strengths
Trusted by over 220,000 students.
 
Arrow Down Arrow Down
 
Error
Oops! Something went wrong.
Let’s refresh the page!
Error
Oops! Something went wrong.
Let’s refresh the page!
We got your request!
A consultant will be contacting you in the next few days to schedule a demo!
*By submitting your phone number, we have your permission to contact you regarding Geniebook. See our Privacy Policy.