Measures and time · Ages 8–9

Seconds, the 24-hour clock and timetables worksheet

Covers: Seconds, When it starts and ends, The 24-hour clock, Reading timetables

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Measures and time · Ages 8–9

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

1.8 minutes = seconds
Answer:
2.1 min 15 s = s
Answer:
3.An activity starts at 7:15 a.m. and lasts 1 hour 50 minutes. It ends at : a.m. (hour, then minutes).
Fill in each blank
Answer:
4.6 p.m. = ?:00
Answer:
5.15:00 = ? p.m.
Answer:
6.2 a.m. = ?:00
Answer:
7.Look at the bus timetable. How many minutes does bus 1 take from stop A to stop B?
Answer:

8.54 seconds is longer than 1 minute.
True or false?
Answer:
9.An activity starts at 8:35 a.m. and lasts 2 hours. When does it end?
- A. 9:35 a.m.
- B. 11:35 a.m.
- C. 6:35 a.m.
- D. 10:35 a.m.
Choose the right answer
Answer:
10.An activity starts at 7:05 a.m., lasts 1 hour 55 minutes, and ends at 9:00 a.m..
True or false?
Answer:
11.Look at the bus timetable. Which bus takes the shortest time from stop A to stop B?
- A. Bus 4
- B. Bus 3
- C. Bus 1
- D. Bus 2
Choose the right answer
Answer:
12.Tsz-hin, Ka-lok, Ka-yan and Tsz-ching each run 400 m, in the times below. Who is fastest?
- A. Tsz-ching: 105 s
- B. Ka-yan: 1 min 57 s
- C. Tsz-hin: 1 min 28 s
- D. Ka-lok: 108 s
Choose the right answer
Answer:

13.Four children run 50 m in 14 s, 10 s, 16 s and 12 s. How many seconds did the second fastest take?
Working:
Answer:
14.A bowl of soup needs 1 min 10 s in the microwave. It has had 37 s. How many more seconds does it need?
Working:
Answer:
15.A film lasts 2 hours 25 minutes and finishes at 9:05 p.m.. It started at : p.m. (hour, then minutes).
Fill in each blank
Working:
Answer:
16.A shop is open every day from 9:00 a.m. to 8:00 p.m.. How many hours is it open each day?
Working:
Answer:
17.A film starts at 3 p.m. sharp. On the 24-hour clock, what hour does it start at?
Working:
Answer:
18.In a 400 m race the winner takes 1 min 19 s, and the runner-up is 4 s slower. How many seconds does the runner-up take?
Working:
Answer:

Show the answers and working

Seconds, the 24-hour clock and timetables worksheet: Answers and working

1. 480
Each minute is 60 seconds, so multiply 8 by 60.
1 minute = 60 seconds: 8 × 60 = 480.
2. 75
Change the 1 minute into seconds first, then add 15 s.
1 minute is 60 seconds: 60 + 15 = 75.
3. 9, 5
From 7:15 a.m., add the hours first, then the minutes; 60 minutes carry as an hour.
Count on 1 hour 50 minutes from 7:15 a.m.: 9:05 a.m..
4. 6 p.m. = 18:00
6 p.m.: afternoon hours gain 12, 6 + 12 = 18 → 18:00
5. 15:00 = 3 p.m.
15:00: 13:00 to 23:00 lose 12 to give the p.m. hour, 15 − 12 = 3 → 3 p.m.
6. 2 a.m. = 2:00
2 a.m.: morning times stay as they are, no 12 added → 2:00 (written 02:00)
7. 16 minutes
Bus 1's two times are in one column. Count from its stop A time to its stop B time, to the o'clock first.
Bus 1's two times are in one column: count from leaving to arriving, to the o'clock first and then the rest: 16 minutes.

8. False
Change 1 minute into seconds, then compare with 54 seconds.
1 minute = 60 seconds: compare 54 with 60.
9. D. 10:35 a.m.
After whole hours the minutes don't change. From 8:35 a.m., count on an hour at a time, 2 times.
The minutes stay the same; just add 2 to the hour: 2 hours after 8:35 a.m. is 10:35 a.m..
10. True
Add 1 hour 55 minutes to 7:05 a.m. yourself to find the end, then compare it with 9:00 a.m..
The minutes add up past 60, which carries an hour: it ends at 9:00 a.m..
11. D. Bus 2
Work out each bus's minutes from stop A to stop B. Leaving first doesn't mean taking least time.
Bus by bus: 21, 10, 26, 17 minutes. Bus 2 is the shortest; leaving first doesn't mean taking least time.
12. C. Tsz-hin: 1 min 28 s
Fewer seconds is faster. Change each "1 min and some seconds" into seconds first (1 min = 60 s), then compare.
Change every time into seconds: 1 min = 60 s, so 1 min 28 s = 88 s and 1 min 57 s = 117 s. In a race fewer seconds is faster: 88 s is the least.

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

13. 12 s
Less time is faster. Put the four times in order from least to most first.
Least time first: 10, 12, 14, 16. The second fastest took 12 s.
14. 33 s
Change 1 min 10 s all into seconds first, then subtract the 37 s it has had.
1 min 10 s = 70 s; 70 − 37 = 33.
15. 6, 40
To find the start, count back from 9:05 p.m.: subtract the hours first, then the minutes.
Count back 2 hours 25 minutes from 9:05 p.m.: 6:40 p.m..
16. 11 hours
The opening hours cross noon. Count the hours from 9:00 a.m. to noon, then from noon to 8:00 p.m..
From 9:00 a.m. to noon, then on to 8:00 p.m.: 11 hours.
17. A film starts at 3 p.m. sharp. On the 24-hour clock, what hour does it start at? (Answer: 15:00)
3 + 12 = 15
18. 83 s
Change 1 min 19 s into seconds first. Slower means more time: add or subtract?
1 min 19 s = 79 s. Slower means more time: 79 + 4 = 83.