Measures and time · Ages 11–12

Working with time and time zones worksheet

Covers: Hours, minutes and seconds, Start, finish and time taken, Time zones

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Measures and time · Ages 11–12

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Name:Date:Score:／48

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

1.0.75 hours = minutes
Answer:
2.1112 hour = minutes
Answer:
3.42 seconds = minutes (as a decimal)
Answer:
4.1 hours 24 minutes = hours (as a decimal)
Answer:
5.Starting at 17:30, 20 minutes later it is hours minutes (24-hour clock).
Fill in each blank
Answer:
6.An event ended at 20:45 after 2 hours 5 minutes. It started at hours minutes (24-hour clock).
Fill in each blank
Answer:
7.How many minutes is it from 22:20 at night to 05:40 the next day?
Answer:
8.It is 20:55 in Hong Kong. London is 8 hours behind Hong Kong. In London it is hours minutes (24-hour clock).
Fill in each blank
Answer:
9.It is 22:45 at night in Hong Kong. Sydney is 2 hours ahead of Hong Kong. In Sydney it is hours minutes the next day (24-hour clock).
Fill in each blank
Answer:

10.Starting at 17:35, 30 minutes later it is 18:45.
True or false?
Answer:
11.It is 06:25 on Monday in Hong Kong. New York is 13 hours behind Hong Kong. What day is it in New York?
- A. Monday
- B. Tuesday
- C. Saturday
- D. Sunday
Choose the right answer
Answer:
12.It is 08:25 in Hong Kong and London is 8 hours behind, so it is 00:25 in London.
True or false?
Answer:

13.Ming practises the piano for 30 minutes a day. How many hours is that in a week (7 days), as a decimal?
Working:
Answer:
14.Tsz-hin holds a plank for 3.5 minutes. How many seconds is that?
Working:
Answer:
15.A plane takes off at 21:45 at night and lands at 08:20 the next day (both places keep the same time). How many minutes was the flight?
Working:
Answer:
16.A train leaves at 06:00, and the journey takes 35 minutes. It arrives at hours minutes (24-hour clock).
Fill in each blank
Working:
Answer:
17.Tsz-ching's dad works in London and gets up at 06:10 every morning. London is 7 hours behind Hong Kong. To call him just as he gets up, Tsz-ching must call at hours minutes, Hong Kong time.
Fill in each blank
Working:
Answer:
18.A football match in London kicks off at 21:00 on Wednesday, London time. London is 7 hours behind Hong Kong. Tsz-ching watches it live in Hong Kong. What day is it in Hong Kong then?
- A. Thursday
- B. Wednesday
- C. Friday
- D. Tuesday
Choose the right answer
Working:
Answer:

Show the answers and working

Working with time and time zones worksheet: Answers and working

1. 45
To a smaller unit, multiply: 1 hour = 60 minutes, so 0.75 hours is 0.75 lots of 60.
Into a smaller unit, × 60: 0.75 × 60 = 45.
2. 55
How many minutes is 112 hour? Work out 60 ÷ 12, then think about 11 of them.
112 hour is 60 ÷ 12 = 5 minutes, so 11 of them are 55 minutes.
3. 0.7
60 seconds = 1 minute. How many 60s are there in 42?
42 ÷ 60 = 0.7.
4. 1.4
Change 24 minutes into hours first, 24 ÷ 60, then add the 1 hours.
24 ÷ 60 = 0.4; with the 1: 1.4 hours.
5. 17, 50
Add 20 minutes to 17:30: hours first, then minutes, carrying an hour at 60.
17:30 + 20 minutes = 17:50: every 60 minutes carry into an hour.
6. 18, 40
Start = finish − time taken. Count back 2 hours 5 minutes from 20:45.
Start = finish − time taken: 20:45 − 2 hours 5 minutes = 18:40; when the minutes are too few to subtract, borrow 60.
7. 440 minutes
Do it in two pieces: from 22:20 to midnight, 24:00, then on to 05:40 the next day.
To midnight 24:00 first: 100 minutes; then the next day's 340: 440 minutes.
8. 12, 55
London is behind, so subtract. Count back 8 hours from 20:55.
Behind means subtract: 20:55 − 8 hours = 12:55.
9. 0, 45
22:45 plus 2 hours goes past 24:00. However far past it goes is the time the next day.
22:45 + 2 hours goes past midnight, 24:00; take off 24 hours: 00:45 the next day.

10. False
Add 30 minutes to 17:35, carrying an hour once the minutes pass 60. Then compare with 18:45.
The minutes pass 60, so carry an hour: 18:05.
11. D. Sunday
Does 06:25 minus 13 hours go back past midnight? If so, it is the day before.
New York's time is Hong Kong's minus 13 hours: 17:25; going back past midnight means the day before.
12. True
London is behind: should the 8 hours be added or subtracted? Work it out and compare with 00:25.
London is behind, so subtract: 08:25 − 8 hours = 00:25.

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

13. 3.5 hours
Find the minutes in a week first, 30 × 7, then change them into hours.
30 × 7 = 210 minutes; 210 ÷ 60 = 3.5 hours.
14. 210 seconds
A minute is 60 seconds, so 3.5 minutes is 3.5 lots of 60.
3.5 × 60 = 210.
15. 635 minutes
Do it in two pieces: from 21:45 to midnight, 24:00, then on to 08:20 the next day.
135 minutes to midnight, then the next day's 500: 635.
16. 6, 35
Arrival = departure + journey. Add 35 minutes to 06:00, carrying an hour at 60 minutes.
Arrival = departure + journey: 06:00 + 35 minutes = 06:35.
17. 13, 10
Hong Kong is 7 hours ahead of London. To turn London's 06:10 into Hong Kong time, add or subtract?
Hong Kong is 7 hours ahead of London, so add: 06:10 + 7 hours = 13:10.
18. A. Thursday
Hong Kong is 7 hours ahead. Does 21:00 plus 7 hours go past midnight?
Hong Kong time = London time + 7 hours, which is 04:00; past midnight, it is the next day.