Converting from 12-hour to 24-hour clocks worksheet - Free Printable

Let's solve each part of the worksheet step by step.

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A) Convert each time from 12-hour to 24-hour clock

Rules:
- For a.m. times: Keep the same hours, but:
- 12:00 a.m. = 00:00
- 1:00 a.m. = 01:00, ..., 11:59 a.m. = 11:59
- For p.m. times: Add 12 to the hour (except 12 p.m., which is 12:00):
- 1:00 p.m. = 13:00, ..., 11:59 p.m. = 23:59
- 12:00 p.m. = 12:00

Now let’s convert:

1) 7:12 a.m. → 07:12
2) 10:05 p.m. → 10 + 12 = 22:05
3) 2:43 p.m. → 2 + 12 = 14:43
4) 5:31 a.m. → 05:31
5) 9:24 a.m. → 09:24
6) 11:56 p.m. → 11 + 12 = 23:56
7) 6:39 p.m. → 6 + 12 = 18:39
8) 3:00 a.m. → 03:00

✔ Answers for A):
1) 07:12
2) 22:05
3) 14:43
4) 05:31
5) 09:24
6) 23:56
7) 18:39
8) 03:00

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B) Read each analog clock and write in 24-hour format

We’ll read each clock carefully.

#### 1)
- Hour hand: between 1 and 2 → 1:30 p.m.
- Minute hand: on 6 → 30 minutes
- Time: 1:30 p.m. → 13:30

#### 2)
- Hour hand: between 5 and 6 → 5:30 a.m.
- Minute hand: on 6 → 30 minutes
- Time: 5:30 a.m. → 05:30

#### 3)
- Hour hand: pointing at 9 → 9:00 p.m.
- Minute hand: on 12 → 0 minutes
- Time: 9:00 p.m. → 21:00

#### 4)
- Hour hand: between 10 and 11 → 10:45 a.m.
- Minute hand: on 9 → 45 minutes
- Time: 10:45 a.m. → 10:45

#### 5)
- Hour hand: between 3 and 4 → 3:15 p.m.
- Minute hand: on 3 → 15 minutes
- Time: 3:15 p.m. → 15:15

#### 6)
- Hour hand: between 1 and 2 → 1:00 a.m.
- Minute hand: on 12 → 0 minutes
- Time: 1:00 a.m. → 01:00

✔ Answers for B):
1) 13:30
2) 05:30
3) 21:00
4) 10:45
5) 15:15
6) 01:00

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C) The flight to Dallas will depart at 03:45 p.m. Express this in 24-hour format.

- 3:45 p.m. → 3 + 12 = 15 → 15:45

✔ Answer: 15:45

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✔ Final Answers:

A)
1) 07:12
2) 22:05
3) 14:43
4) 05:31
5) 09:24
6) 23:56
7) 18:39
8) 03:00

B)
1) 13:30
2) 05:30
3) 21:00
4) 10:45
5) 15:15
6) 01:00

C) 15:45

Let me know if you'd like this formatted as a printable answer key!