To convert time from the 12-hour clock to the 24-hour clock, we follow these simple rules:
1.
For AM times:
* If the time is
12:00 am (midnight), it becomes
00:00.
* For any other AM time (1 am to 11 am), just remove the "am". The numbers stay exactly the same. (Note: Single-digit hours like 9 am are often written with a zero in front, like 09:00, but 9:00 is also correct).
2.
For PM times:
* If the time is
12:00 pm (noon), it stays
12:00. Do not add 12.
* For any other PM time (1 pm to 11 pm), add
12 to the hour number and remove the "pm".
* Example: $1 + 12 = 13$, so 1:00 pm is 13:00.
* Example: $6 + 12 = 18$, so 6:00 pm is 18:00.
Let's solve each problem step-by-step:
1.
9:25 pm: It is PM and not 12:00. Add 12 to the hour (9). $9 + 12 = 21$. The minutes stay the same. ->
21:25
2.
6:15 am: It is AM and not 12:00. Keep the numbers the same. ->
6:15 (or 06:15)
3.
2:55 pm: It is PM and not 12:00. Add 12 to the hour (2). $2 + 12 = 14$. ->
14:55
4.
10:00 am: It is AM. Keep the numbers the same. ->
10:00
5.
7:30 pm: It is PM. Add 12 to the hour (7). $7 + 12 = 19$. ->
19:30
6.
4:00 am: It is AM. Keep the numbers the same. ->
4:00 (or 04:00)
7.
3:30 pm: It is PM. Add 12 to the hour (3). $3 + 12 = 15$. ->
15:30
8.
8:15 am: It is AM. Keep the numbers the same. ->
8:15 (or 08:15)
9.
3:00 pm: It is PM. Add 12 to the hour (3). $3 + 12 = 15$. ->
15:00
10.
2:30 am: It is AM. Keep the numbers the same. ->
2:30 (or 02:30)
11.
1:00 pm: It is PM. Add 12 to the hour (1). $1 + 12 = 13$. ->
13:00
12.
8:40 am: It is AM. Keep the numbers the same. ->
8:40 (or 08:40)
13.
12:00 pm: This is noon. In 24-hour time, 12:00 pm stays
12:00.
14.
11:00 am: It is AM. Keep the numbers the same. ->
11:00
15.
7:15 pm: It is PM. Add 12 to the hour (7). $7 + 12 = 19$. ->
19:15
16.
9:40 am: It is AM. Keep the numbers the same. ->
9:40 (or 09:40)
17.
1:45 pm: It is PM. Add 12 to the hour (1). $1 + 12 = 13$. ->
13:45
18.
2:50 am: It is AM. Keep the numbers the same. ->
2:50 (or 02:50)
19.
10:35 pm: It is PM. Add 12 to the hour (10). $10 + 12 = 22$. ->
22:35
20.
5:00 am: It is AM. Keep the numbers the same. ->
5:00 (or 05:00)
Final Answer:
1. 21:25
2. 6:15
3. 14:55
4. 10:00
5. 19:30
6. 4:00
7. 15:30
8. 8:15
9. 15:00
10. 2:30
11. 13:00
12. 8:40
13. 12:00
14. 11:00
15. 19:15
16. 9:40
17. 13:45
18. 2:50
19. 22:35
20. 5:00
Parent Tip: Review the logic above to help your child master the concept of math worksheet on time.
