24 Hour Clock Conversion Worksheets - Free Printable

Explanation:
To convert a time from a 12-hour clock to a 24-hour clock, follow these rules:

- If the time is in the morning (am), keep the hour the same.
But if the hour is 12, change it to 00.
For example:
12:25am becomes 00:25
9:20am becomes 09:20

- If the time is in the afternoon or evening (pm), add 12 to the hour.
But if the hour is 12, it stays 12.
For example:
4:25pm becomes 16:25 (4 + 12 = 16)
12:10pm becomes 12:10 (no change)

Now let's go through each time in the table.

First column (12-hour to 24-hour):
- 4:25am → am, not 12, so keep 4 → 04:25
- 9:20am → am, not 12 → 09:20
- 2:55am → am, not 12 → 02:55
- 11:35am → am, not 12 → 11:35
- 1:07am → am, not 12 → 01:07
- 12:42am → am, it is 12 → change to 00 → 00:42
- 6:13am → am, not 12 → 06:13

Second column (12-hour to 24-hour):
- 4:25pm → pm, not 12 → 4 + 12 = 16 → 16:25
- 9:20pm → pm, not 12 → 9 + 12 = 21 → 21:20
- 2:55pm → pm, not 12 → 2 + 12 = 14 → 14:55
- 11:35pm → pm, not 12 → 11 + 12 = 23 → 23:35
- 1:07pm → pm, not 12 → 1 + 12 = 13 → 13:07
- 12:42pm → pm, it is 12 → stays 12 → 12:42
- 6:13pm → pm, not 12 → 6 + 12 = 18 → 18:13

Final Answer:
12 hour | 24 hour
4:25am | 04:25
9:20am | 09:20
2:55am | 02:55
11:35am | 11:35
1:07am | 01:07
12:42am | 00:42
6:13am | 06:13

12 hour | 24 hour
4:25pm | 16:25
9:20pm | 21:20
2:55pm | 14:55
11:35pm | 23:35
1:07pm | 13:07
12:42pm | 12:42
6:13pm | 18:13