Measures and time · Ages 7–8

Timekeepers old and new worksheet

Part of: Hours, minutes and the calendar

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Measures and time · Ages 7–8

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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.An hourglass takes 5 minutes to run out. Turned over and over, it runs out 5 times. How many minutes is that?
Answer:
2.An hourglass takes 1 minutes to run out. Turned over and over, it runs out 5 times. How many minutes is that?
Answer:
3.An hourglass takes 1 minutes to run out. Turned over and over, it runs out 2 times. How many minutes is that?
Answer:
4.To time 4 minutes with a 2-minute hourglass, how many times must it run out?
Answer:
5.To time 25 minutes with a 5-minute hourglass, how many times must it run out?
Answer:
6.A 6-minute and a 7-minute hourglass are started together. From when the 6-minute one runs out to when the 7-minute one does, how many minutes pass?
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7.A 2-minute and a 10-minute hourglass are started together. From when the 2-minute one runs out to when the 10-minute one does, how many minutes pass?
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8.A 2-minute and a 4-minute hourglass are started together. From when the 2-minute one runs out to when the 4-minute one does, how many minutes pass?
Answer:

9.Which of these timekeepers tells the time from the sun's shadow?
- A. A sundial
- B. An hourglass
- C. A water clock
- D. A digital clock
Choose the right answer
Answer:
10.A 2-minute hourglass running out 3 times makes 5 minutes.
True or false?
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11.A 3-minute hourglass running out 3 times makes 6 minutes.
True or false?
Answer:
12.A 2-minute hourglass running out 3 times makes 6 minutes.
True or false?
Answer:

13.Tsz-ching times tooth-brushing with a 2-minute hourglass and brushes twice a day. In 4 days, how many minutes is that?
Working:
Answer:
14.Chi-keung turns a 3-minute hourglass over and over until it has run out 2 times, then waits 4 more minutes. How many minutes is that?
Working:
Answer:
15.A soft-boiled egg takes 4 minutes. Tsz-hin has only a 2-minute hourglass. How many times must it run out?
Working:
Answer:
16.Tsz-hin turns a 5-minute hourglass over and over until it has run out 3 times, then waits 2 more minutes. How many minutes is that?
Working:
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17.A soft-boiled egg takes 15 minutes. Ka-yan has only a 5-minute hourglass. How many times must it run out?
Working:
Answer:
18.Tsz-hin times tooth-brushing with a 2-minute hourglass and brushes twice a day. In 3 days, how many minutes is that?
Working:
Answer:

Show the answers and working

Timekeepers old and new worksheet: Answers and working

1. 25 minutes
The hourglass takes 5 minutes every time. Running out 5 times is 5 lots of 5.
5 minutes each time, 5 times: 5 lots of 5 is 25.
2. 5 minutes
The hourglass takes 1 minutes every time. Running out 5 times is 5 lots of 1.
1 minutes each time, 5 times: 5 lots of 1 is 5.
3. 2 minutes
The hourglass takes 1 minutes every time. Running out 2 times is 2 lots of 1.
1 minutes each time, 2 times: 2 lots of 1 is 2.
4. 2 times
Each run is 2 minutes. Counting in 2s, how many counts to reach 4?
2 minutes a time: counting in 2s to 4 takes 2.
5. 5 times
Each run is 5 minutes. Counting in 5s, how many counts to reach 25?
5 minutes a time: counting in 5s to 25 takes 5.
6. 1 minute
Both start together. At which minute does the 6-minute one run out? And the 7-minute one?
One runs out at minute 6, the other at minute 7: 7 − 6 = 1.
7. 8 minutes
Both start together. At which minute does the 2-minute one run out? And the 10-minute one?
One runs out at minute 2, the other at minute 10: 10 − 2 = 8.
8. 2 minutes
Both start together. At which minute does the 2-minute one run out? And the 4-minute one?
One runs out at minute 2, the other at minute 4: 4 − 2 = 2.

9. A. A sundial
Think about what each one uses to keep time: which needs sunshine to work?
A sundial's pointer casts a shadow in the sun, and where it falls shows the time.
10. False
3 runs of 2 minutes each is 3 lots of 2. Work it out, then compare with 5.
3 lots of 2 minutes is 6.
11. False
3 runs of 3 minutes each is 3 lots of 3. Work it out, then compare with 6.
3 lots of 3 minutes is 9.
12. True
3 runs of 2 minutes each is 3 lots of 2. Work it out, then compare with 6.
3 lots of 2 minutes is 6.

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

13. 16 minutes
Start with one day: two brushes of 2 minutes each. How many minutes is that? Then think about 4 days.
Twice a day is 4 minutes; 4 days make 16.
14. 10 minutes
First work out 2 runs of 3 minutes, 2 lots of 3; then don't forget the 4 minutes of waiting.
2 lots of 3 is 6, plus 4: 10.
15. 2 times
The hourglass runs 2 minutes each time. Counting in 2s, how many counts to reach 4?
Counting in 2s to 4 takes 2.
16. 17 minutes
First work out 3 runs of 5 minutes, 3 lots of 5; then don't forget the 2 minutes of waiting.
3 lots of 5 is 15, plus 2: 17.
17. 3 times
The hourglass runs 5 minutes each time. Counting in 5s, how many counts to reach 15?
Counting in 5s to 15 takes 3.
18. 12 minutes
Start with one day: two brushes of 2 minutes each. How many minutes is that? Then think about 3 days.
Twice a day is 4 minutes; 3 days make 12.

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