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.

New variation Try interactive challenge Browse templates

Age band:Ages 10-12 Ages 13-15

Choose “Save as PDF” to keep a copy. Use your browser’s paper setting for A4 or Letter.

Worksheet StudioPractice pack · Ages 10-12

12-hour & 24-hour clock

Take your time. Show your thinking.

1. Write 8:35 pm in 24-hour clock format.
8 · 35 · 24 · 12-hour & 24-hour clock
2. Write 11:00 pm in 24-hour clock format.
11 · 00 · 24 · 12-hour & 24-hour clock
3. Write 1:05 pm in 24-hour clock format.
1 · 05 · 24 · 12-hour & 24-hour clock
4. Write 3:30 pm in 24-hour clock format.
3 · 30 · 24 · 12-hour & 24-hour clock
5. Write 5:30 pm in 24-hour clock format.
5 · 30 · 24 · 12-hour & 24-hour clock
6. Write 5:40 pm in 24-hour clock format.
5 · 40 · 24 · 12-hour & 24-hour clock
7. Write 5:35 pm in 24-hour clock format.
5 · 35 · 24 · 12-hour & 24-hour clock
8. Write 8:20 pm in 24-hour clock format.
8 · 20 · 24 · 12-hour & 24-hour clock
9. Write 8:30 pm in 24-hour clock format.
8 · 30 · 24 · 12-hour & 24-hour clock
10. Write 7:10 pm in 24-hour clock format.
7 · 10 · 24 · 12-hour & 24-hour clock
11. Write 1:20 pm in 24-hour clock format.
1 · 20 · 24 · 12-hour & 24-hour clock
12. Write 11:25 pm in 24-hour clock format.
11 · 25 · 24 · 12-hour & 24-hour clock

12 questions · Seed 54 · 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 8:35 pm in 24-hour clock format.
20:35
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 8 + 12 = 20, giving 20:35.
2. Write 11:00 pm in 24-hour clock format.
23:00
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 11 + 12 = 23, giving 23:00.
3. Write 1:05 pm in 24-hour clock format.
13:05
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 1 + 12 = 13, giving 13:05.
4. 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.
5. Write 5:30 pm in 24-hour clock format.
17:30
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 5 + 12 = 17, giving 17:30.
6. Write 5:40 pm in 24-hour clock format.
17:40
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 5 + 12 = 17, giving 17:40.
7. Write 5:35 pm in 24-hour clock format.
17:35
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 5 + 12 = 17, giving 17:35.
8. Write 8:20 pm in 24-hour clock format.
20:20
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 8 + 12 = 20, giving 20:20.
9. Write 8:30 pm in 24-hour clock format.
20:30
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 8 + 12 = 20, giving 20:30.
10. Write 7:10 pm in 24-hour clock format.
19:10
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 7 + 12 = 19, giving 19:10.
11. Write 1:20 pm in 24-hour clock format.
13:20
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 1 + 12 = 13, giving 13:20.
12. 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.

12 questions · Seed 54 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 10-12

12-hour & 24-hour clock

Take your time. Show your thinking.

1. Write 8:35 pm in 24-hour clock format.
8 · 35 · 24 · 12-hour & 24-hour clock
2. Write 11:00 pm in 24-hour clock format.
11 · 00 · 24 · 12-hour & 24-hour clock
3. Write 1:05 pm in 24-hour clock format.
1 · 05 · 24 · 12-hour & 24-hour clock
4. Write 3:30 pm in 24-hour clock format.
3 · 30 · 24 · 12-hour & 24-hour clock
5. Write 5:30 pm in 24-hour clock format.
5 · 30 · 24 · 12-hour & 24-hour clock
6. Write 5:40 pm in 24-hour clock format.
5 · 40 · 24 · 12-hour & 24-hour clock
7. Write 5:35 pm in 24-hour clock format.
5 · 35 · 24 · 12-hour & 24-hour clock
8. Write 8:20 pm in 24-hour clock format.
8 · 20 · 24 · 12-hour & 24-hour clock
9. Write 8:30 pm in 24-hour clock format.
8 · 30 · 24 · 12-hour & 24-hour clock
10. Write 7:10 pm in 24-hour clock format.
7 · 10 · 24 · 12-hour & 24-hour clock
11. Write 1:20 pm in 24-hour clock format.
1 · 20 · 24 · 12-hour & 24-hour clock
12. Write 11:25 pm in 24-hour clock format.
11 · 25 · 24 · 12-hour & 24-hour clock

12 questions · Seed 54 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 10-12

12-hour & 24-hour clock

Answers and reasoning. Review before teaching.

1. Write 8:35 pm in 24-hour clock format.
20:35
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 8 + 12 = 20, giving 20:35.
2. Write 11:00 pm in 24-hour clock format.
23:00
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 11 + 12 = 23, giving 23:00.
3. Write 1:05 pm in 24-hour clock format.
13:05
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 1 + 12 = 13, giving 13:05.
4. 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.
5. Write 5:30 pm in 24-hour clock format.
17:30
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 5 + 12 = 17, giving 17:30.
6. Write 5:40 pm in 24-hour clock format.
17:40
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 5 + 12 = 17, giving 17:40.
7. Write 5:35 pm in 24-hour clock format.
17:35
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 5 + 12 = 17, giving 17:35.
8. Write 8:20 pm in 24-hour clock format.
20:20
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 8 + 12 = 20, giving 20:20.
9. Write 8:30 pm in 24-hour clock format.
20:30
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 8 + 12 = 20, giving 20:30.
10. Write 7:10 pm in 24-hour clock format.
19:10
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 7 + 12 = 19, giving 19:10.
11. Write 1:20 pm in 24-hour clock format.
13:20
For afternoon and evening pm times from 1:00 pm to 11:59 pm, add 12 to the hour: 1 + 12 = 13, giving 13:20.
12. 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.

12 questions · Seed 54 · Age guidance, not curriculum certification