Time & moneyAges 10-12

12-hour & 24-hour clock

Convert afternoon and evening 12-hour times into standard 24-hour clock notation. Review suitability for your learners before teaching.

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Age band:Ages 10-12 Ages 13-15

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Worksheet StudioPractice pack · Ages 10-12

12-hour & 24-hour clock

Take your time. Show your thinking.

1. Write 10:55 pm in 24-hour clock format.
10 · 55 · 24 · 12-hour & 24-hour clock
2. Write 10:30 pm in 24-hour clock format.
10 · 30 · 24 · 12-hour & 24-hour clock
3. Write 4:50 pm in 24-hour clock format.
4 · 50 · 24 · 12-hour & 24-hour clock
4. Write 10:00 pm in 24-hour clock format.
10 · 00 · 24 · 12-hour & 24-hour clock
5. Write 1:50 pm in 24-hour clock format.
1 · 50 · 24 · 12-hour & 24-hour clock
6. Write 6:25 pm in 24-hour clock format.
6 · 25 · 24 · 12-hour & 24-hour clock
7. Write 5:15 pm in 24-hour clock format.
5 · 15 · 24 · 12-hour & 24-hour clock
8. Write 11:25 pm in 24-hour clock format.
11 · 25 · 24 · 12-hour & 24-hour clock
9. Write 6:40 pm in 24-hour clock format.
6 · 40 · 24 · 12-hour & 24-hour clock
10. Write 6:30 pm in 24-hour clock format.
6 · 30 · 24 · 12-hour & 24-hour clock
11. Write 3:45 pm in 24-hour clock format.
3 · 45 · 24 · 12-hour & 24-hour clock
12. Write 9:50 pm in 24-hour clock format.
9 · 50 · 24 · 12-hour & 24-hour clock

12 questions · Seed 55 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 10-12

12-hour & 24-hour clock

Answers and reasoning. Review before teaching.

1. Write 10:55 pm in 24-hour clock format.
22:55
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 10 + 12 = 22, giving 22:55.
2. Write 10:30 pm in 24-hour clock format.
22:30
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 10 + 12 = 22, giving 22:30.
3. Write 4:50 pm in 24-hour clock format.
16:50
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 4 + 12 = 16, giving 16:50.
4. Write 10:00 pm in 24-hour clock format.
22:00
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 10 + 12 = 22, giving 22:00.
5. Write 1:50 pm in 24-hour clock format.
13:50
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 1 + 12 = 13, giving 13:50.
6. Write 6:25 pm in 24-hour clock format.
18:25
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 6 + 12 = 18, giving 18:25.
7. Write 5:15 pm in 24-hour clock format.
17:15
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 5 + 12 = 17, giving 17:15.
8. Write 11:25 pm in 24-hour clock format.
23:25
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 11 + 12 = 23, giving 23:25.
9. Write 6:40 pm in 24-hour clock format.
18:40
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 6 + 12 = 18, giving 18:40.
10. Write 6:30 pm in 24-hour clock format.
18:30
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 6 + 12 = 18, giving 18:30.
11. Write 3:45 pm in 24-hour clock format.
15:45
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 3 + 12 = 15, giving 15:45.
12. Write 9:50 pm in 24-hour clock format.
21:50
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 9 + 12 = 21, giving 21:50.

12 questions · Seed 55 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 10-12

12-hour & 24-hour clock

Take your time. Show your thinking.

1. Write 10:55 pm in 24-hour clock format.
10 · 55 · 24 · 12-hour & 24-hour clock
2. Write 10:30 pm in 24-hour clock format.
10 · 30 · 24 · 12-hour & 24-hour clock
3. Write 4:50 pm in 24-hour clock format.
4 · 50 · 24 · 12-hour & 24-hour clock
4. Write 10:00 pm in 24-hour clock format.
10 · 00 · 24 · 12-hour & 24-hour clock
5. Write 1:50 pm in 24-hour clock format.
1 · 50 · 24 · 12-hour & 24-hour clock
6. Write 6:25 pm in 24-hour clock format.
6 · 25 · 24 · 12-hour & 24-hour clock
7. Write 5:15 pm in 24-hour clock format.
5 · 15 · 24 · 12-hour & 24-hour clock
8. Write 11:25 pm in 24-hour clock format.
11 · 25 · 24 · 12-hour & 24-hour clock
9. Write 6:40 pm in 24-hour clock format.
6 · 40 · 24 · 12-hour & 24-hour clock
10. Write 6:30 pm in 24-hour clock format.
6 · 30 · 24 · 12-hour & 24-hour clock
11. Write 3:45 pm in 24-hour clock format.
3 · 45 · 24 · 12-hour & 24-hour clock
12. Write 9:50 pm in 24-hour clock format.
9 · 50 · 24 · 12-hour & 24-hour clock

12 questions · Seed 55 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 10-12

12-hour & 24-hour clock

Answers and reasoning. Review before teaching.

1. Write 10:55 pm in 24-hour clock format.
22:55
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 10 + 12 = 22, giving 22:55.
2. Write 10:30 pm in 24-hour clock format.
22:30
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 10 + 12 = 22, giving 22:30.
3. Write 4:50 pm in 24-hour clock format.
16:50
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 4 + 12 = 16, giving 16:50.
4. Write 10:00 pm in 24-hour clock format.
22:00
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 10 + 12 = 22, giving 22:00.
5. Write 1:50 pm in 24-hour clock format.
13:50
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 1 + 12 = 13, giving 13:50.
6. Write 6:25 pm in 24-hour clock format.
18:25
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 6 + 12 = 18, giving 18:25.
7. Write 5:15 pm in 24-hour clock format.
17:15
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 5 + 12 = 17, giving 17:15.
8. Write 11:25 pm in 24-hour clock format.
23:25
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 11 + 12 = 23, giving 23:25.
9. Write 6:40 pm in 24-hour clock format.
18:40
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 6 + 12 = 18, giving 18:40.
10. Write 6:30 pm in 24-hour clock format.
18:30
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 6 + 12 = 18, giving 18:30.
11. Write 3:45 pm in 24-hour clock format.
15:45
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 3 + 12 = 15, giving 15:45.
12. Write 9:50 pm in 24-hour clock format.
21:50
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 9 + 12 = 21, giving 21:50.

12 questions · Seed 55 · Age guidance, not curriculum certification