Measures and time · Ages 11–12

Hours, minutes and seconds worksheet

Part of: Working with time and time zones

In the print window, choose “Save as PDF” to download it. The answers print on the last page.

Measures and time · Ages 11–12

Numsprite
numsprite.com

Name:Date:Score:／48

Write each answer in the space. For word problems, show your working and write a sentence answer.

13.Ka-yee practises the piano for 48 minutes a day. How many hours is that in a week (7 days), as a decimal?
Working:
Answer:
14.Tsz-hin watches a film 75 minutes long. How many hours is that, as a decimal?
Working:
Answer:
15.Tsz-hin holds a plank for 4.75 minutes. How many seconds is that?
Working:
Answer:
16.A jigsaw should take 4 hours. After 30 minutes of work, how many minutes are left?
Working:
Answer:
17.Ka-yan watches a film 135 minutes long. How many hours is that, as a decimal?
Working:
Answer:
18.Ka-lok holds a plank for 4.25 minutes. How many seconds is that?
Working:
Answer:

Show the answers and working

Hours, minutes and seconds worksheet: Answers and working

1. 30
To a smaller unit, multiply: 1 hour = 60 minutes, so 0.5 hours is 0.5 lots of 60.
Into a smaller unit, × 60: 0.5 × 60 = 30.
2. 1.7
To a bigger unit, divide: 60 minutes = 1 hour. How many 60s are there in 102?
Into a bigger unit, ÷ 60: 102 ÷ 60 = 1.7.
3. 1.6
To a bigger unit, divide: 60 minutes = 1 hour. How many 60s are there in 96?
Into a bigger unit, ÷ 60: 96 ÷ 60 = 1.6.
4. 5
How many minutes is 112 hour? Work out 60 ÷ 12, then think about 1 of them.
112 hour is 60 ÷ 12 = 5 minutes, so 1 of them are 5 minutes.
5. 2, 42
The whole part is the hours. The decimal part, 0.7 hour, times 60 gives the minutes.
The whole part is 2 hours; 0.7 × 60 = 42 minutes.
6. 0.1
60 seconds = 1 minute. How many 60s are there in 6?
6 ÷ 60 = 0.1.
7. 4, 24
The whole part is the hours. The decimal part, 0.4 hour, times 60 gives the minutes.
The whole part is 4 hours; 0.4 × 60 = 24 minutes.
8. 3.4
Change 24 minutes into hours first, 24 ÷ 60, then add the 3 hours.
24 ÷ 60 = 0.4; with the 3: 3.4 hours.
9. 2.75
Change 45 minutes into hours first, 45 ÷ 60, then add the 2 hours.
45 ÷ 60 = 0.75; with the 2: 2.75 hours.

10. C. 1 h 36 min
An hour is 60 minutes, not 100. The decimal part, 0.6 hour, must be multiplied by 60.
0.6 × 60 = 36: 1.6 hours = 1 h 36 min.
11. False
How many minutes is 0.4 hour? Multiply by 60, not 100. Then compare with 40.
0.4 hour = 0.4 × 60 = 24 minutes.
12. True
How many minutes is 0.4 hour? Multiply by 60, not 100. Then compare with 24.
0.4 hour = 0.4 × 60 = 24 minutes.

Marking: 2 for the working, 1 for the answer, 1 for the sentence.

13. 5.6 hours
Find the minutes in a week first, 48 × 7, then change them into hours.
48 × 7 = 336 minutes; 336 ÷ 60 = 5.6 hours.
14. 1.25 hours
An hour is 60 minutes. How many lots of 60 minutes are there in 75?
75 ÷ 60 = 1.25.
15. 285 seconds
A minute is 60 seconds, so 4.75 minutes is 4.75 lots of 60.
4.75 × 60 = 285.
16. 210 minutes
The units must match: change 4 hours into minutes first, then subtract the 30 minutes done.
4 hours = 240 minutes; 240 − 30 = 210.
17. 2.25 hours
An hour is 60 minutes. How many lots of 60 minutes are there in 135?
135 ÷ 60 = 2.25.
18. 255 seconds
A minute is 60 seconds, so 4.25 minutes is 4.25 lots of 60.
4.25 × 60 = 255.

Numsprite · numsprite.com/en/worksheets/time-conversion-and-time-zones/hours-minutes-and-seconds