Measures and time · Ages 8–9

Seconds worksheet

Part of: Seconds, the 24-hour clock and timetables

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Measures and time · Ages 8–9

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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.

1.8 minutes = seconds
Answer:
2.The stopwatch hand started at 60 and is now where it is shown. How many seconds have passed?
Answer:
3.10 minutes = seconds
Answer:
4.1 min 31 s = s
Answer:
5.1 min 36 s = s
Answer:
6.Ming runs 100 m in 17 s and May in 15 s. How many fewer seconds did the faster one take?
Answer:
7.May runs 100 m in 14 s and Ming in 16 s. How many fewer seconds did the faster one take?
Answer:

13.A bowl of soup needs 2 min 20 s in the microwave. It has had 30 s. How many more seconds does it need?
Working:
Answer:
14.Four children run 50 m in 15 s, 11 s, 17 s and 13 s. How many seconds did the second fastest take?
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Answer:
15.Tsz-hin skips without stopping for 1 min 40 s. How many seconds is that?
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Answer:
16.Ka-lok swims 25 m in 34 s, and Ka-yan is 6 s slower. How many seconds does Ka-yan take?
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Answer:
17.A bowl of soup needs 1 min 40 s in the microwave. It has had 10 s. How many more seconds does it need?
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18.Tsz-ching skips without stopping for 1 min 30 s. How many seconds is that?
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Answer:

Show the answers and working

Seconds worksheet: Answers and working

1. 480
Each minute is 60 seconds, so multiply 8 by 60.
1 minute = 60 seconds: 8 × 60 = 480.
2. 26 s
Each big number is 5 seconds on. Count in fives to the number before the hand, then the small steps.
Count in fives to the number before the hand, then the extra small steps: 26 s.
3. 600
Each minute is 60 seconds, so multiply 10 by 60.
1 minute = 60 seconds: 10 × 60 = 600.
4. 91
Change the 1 minute into seconds first, then add 31 s.
1 minute is 60 seconds: 60 + 31 = 91.
5. 96
Change the 1 minute into seconds first, then add 36 s.
1 minute is 60 seconds: 60 + 36 = 96.
6. 2 s
Fewer seconds is faster. Take the smaller of 17 s and 15 s from the bigger.
Bigger minus smaller: 2 s.
7. 2 s
Fewer seconds is faster. Take the smaller of 14 s and 16 s from the bigger.
Bigger minus smaller: 2 s.

8. C. seconds
A 50 m run is over quickly. Which unit of time is the shortest?
A 50 m run takes a very short time, so use seconds: about 11 s.
9. True
Change 1 minute into seconds, then compare with 78 seconds.
1 minute = 60 seconds: compare 78 with 60.
10. C. 9 s
Over the same distance, the less time taken, the faster. Look for the fewest seconds.
The one who took the least time was fastest: 9 s.
11. B. 11 s
Over the same distance, the less time taken, the faster. Look for the fewest seconds.
The one who took the least time was fastest: 11 s.
12. False
Change 1 minute into seconds, then compare with 42 seconds.
1 minute = 60 seconds: compare 42 with 60.

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

13. 110 s
Change 2 min 20 s all into seconds first, then subtract the 30 s it has had.
2 min 20 s = 140 s; 140 − 30 = 110.
14. 13 s
Less time is faster. Put the four times in order from least to most first.
Least time first: 11, 13, 15, 17. The second fastest took 13 s.
15. 100 s
Change the 1 minute into seconds first, then add 40 s.
60 + 40 = 100 s.
16. 40 s
Slower means taking more time. Does Ka-yan take more or less than 34 s?
Slower means more time: 34 + 6 = 40 s.
17. 90 s
Change 1 min 40 s all into seconds first, then subtract the 10 s it has had.
1 min 40 s = 100 s; 100 − 10 = 90.
18. 90 s
Change the 1 minute into seconds first, then add 30 s.
60 + 30 = 90 s.

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