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 10:30 pm in 24-hour clock format.
10 · 30 · 24 · 12-hour & 24-hour clock
2. Write 11:15 pm in 24-hour clock format.
11 · 15 · 24 · 12-hour & 24-hour clock
3. Write 6:40 pm in 24-hour clock format.
6 · 40 · 24 · 12-hour & 24-hour clock
4. Write 2:10 pm in 24-hour clock format.
2 · 10 · 24 · 12-hour & 24-hour clock
5. Write 2:50 pm in 24-hour clock format.
2 · 50 · 24 · 12-hour & 24-hour clock
6. Write 8:00 pm in 24-hour clock format.
8 · 00 · 24 · 12-hour & 24-hour clock
7. Write 10:15 pm in 24-hour clock format.
10 · 15 · 24 · 12-hour & 24-hour clock
8. Write 2:30 pm in 24-hour clock format.
2 · 30 · 24 · 12-hour & 24-hour clock
9. Write 9:50 pm in 24-hour clock format.
9 · 50 · 24 · 12-hour & 24-hour clock
10. Write 11:20 pm in 24-hour clock format.
11 · 20 · 24 · 12-hour & 24-hour clock
11. Write 9:35 pm in 24-hour clock format.
9 · 35 · 24 · 12-hour & 24-hour clock
12. Write 3:30 pm in 24-hour clock format.
3 · 30 · 24 · 12-hour & 24-hour clock

12 questions · Seed 52 · 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 10:30 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.
2. Write 11:15 pm in 24-hour clock format.
23:15
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 11 + 12 = 23, giving 23:15.
3. 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.
4. Write 2:10 pm in 24-hour clock format.
14:10
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 2 + 12 = 14, giving 14:10.
5. Write 2:50 pm in 24-hour clock format.
14:50
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 2 + 12 = 14, giving 14:50.
6. Write 8:00 pm in 24-hour clock format.
20:00
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 8 + 12 = 20, giving 20:00.
7. Write 10:15 pm in 24-hour clock format.
22:15
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 10 + 12 = 22, giving 22:15.
8. Write 2:30 pm in 24-hour clock format.
14:30
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 2 + 12 = 14, giving 14:30.
9. 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.
10. Write 11:20 pm in 24-hour clock format.
23:20
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 11 + 12 = 23, giving 23:20.
11. Write 9:35 pm in 24-hour clock format.
21:35
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 9 + 12 = 21, giving 21:35.
12. Write 3:30 pm in 24-hour clock format.
15:30
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 3 + 12 = 15, giving 15:30.

12 questions · Seed 52 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 10-12

12-hour & 24-hour clock

Take your time. Show your thinking.

1. Write 10:30 pm in 24-hour clock format.
10 · 30 · 24 · 12-hour & 24-hour clock
2. Write 11:15 pm in 24-hour clock format.
11 · 15 · 24 · 12-hour & 24-hour clock
3. Write 6:40 pm in 24-hour clock format.
6 · 40 · 24 · 12-hour & 24-hour clock
4. Write 2:10 pm in 24-hour clock format.
2 · 10 · 24 · 12-hour & 24-hour clock
5. Write 2:50 pm in 24-hour clock format.
2 · 50 · 24 · 12-hour & 24-hour clock
6. Write 8:00 pm in 24-hour clock format.
8 · 00 · 24 · 12-hour & 24-hour clock
7. Write 10:15 pm in 24-hour clock format.
10 · 15 · 24 · 12-hour & 24-hour clock
8. Write 2:30 pm in 24-hour clock format.
2 · 30 · 24 · 12-hour & 24-hour clock
9. Write 9:50 pm in 24-hour clock format.
9 · 50 · 24 · 12-hour & 24-hour clock
10. Write 11:20 pm in 24-hour clock format.
11 · 20 · 24 · 12-hour & 24-hour clock
11. Write 9:35 pm in 24-hour clock format.
9 · 35 · 24 · 12-hour & 24-hour clock
12. Write 3:30 pm in 24-hour clock format.
3 · 30 · 24 · 12-hour & 24-hour clock

12 questions · Seed 52 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 10-12

12-hour & 24-hour clock

Answers and reasoning. Review before teaching.

1. Write 10:30 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.
2. Write 11:15 pm in 24-hour clock format.
23:15
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 11 + 12 = 23, giving 23:15.
3. 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.
4. Write 2:10 pm in 24-hour clock format.
14:10
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 2 + 12 = 14, giving 14:10.
5. Write 2:50 pm in 24-hour clock format.
14:50
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 2 + 12 = 14, giving 14:50.
6. Write 8:00 pm in 24-hour clock format.
20:00
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 8 + 12 = 20, giving 20:00.
7. Write 10:15 pm in 24-hour clock format.
22:15
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 10 + 12 = 22, giving 22:15.
8. Write 2:30 pm in 24-hour clock format.
14:30
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 2 + 12 = 14, giving 14:30.
9. 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.
10. Write 11:20 pm in 24-hour clock format.
23:20
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 11 + 12 = 23, giving 23:20.
11. Write 9:35 pm in 24-hour clock format.
21:35
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 9 + 12 = 21, giving 21:35.
12. Write 3:30 pm in 24-hour clock format.
15:30
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 3 + 12 = 15, giving 15:30.

12 questions · Seed 52 · Age guidance, not curriculum certification