Using the 24-hour Clock: What's the Time? Worksheet

Remember that 24 hour clock time uses 4 numbers separating the hours from the minutes with a : sign.

Also, after 12:00 pm on the 24 hour clock, continue counting into the teens and twenties for the hours: 13 (1pm) all the way to 24 (12 midnight).

7.35 a.m. is 07:35

7.35 p.m. is 19:35

Example

What 24 hour clock time is 46 minutes after 7.35 p.m.?

Answer

We start on the hour at 7.00 p.m. and then add 46 minutes and 35 minutes from the question.

35 + 46 = 81 minutes.

81 minutes is 1 hour (60 minutes) and 21 minutes.

1 hour and 21 minutes after 7.00 p.m. is 8.21 p.m.

8.21 p.m. is 20:21 in 24 hour clock time.

Write the following time in 24 hour clock format:

15 minutes after 8.35 a.m.

Write the following time in 24 hour clock format:

15 minutes after 8.35 p.m.

Write the following time in 24 hour clock format:

15 minutes before 8.35 p.m.

Write the following time in 24 hour clock format:

45 minutes before 8.35 p.m.

Write the following time in 24 hour clock format:

45 minutes before 8.05 a.m.

Write the following time in 24 hour clock format:

100 minutes before 8.05 a.m.

Write the following time in 24 hour clock format:

100 minutes after 8.45 p.m.

Write the following time in 24 hour clock format:

65 minutes after 10.45 p.m.

Write the following time in 24 hour clock format:

65 minutes before 10.25 p.m.

Write the following time in 24 hour clock format:

75 minutes before 1.05 a.m.

ANSWERS

Question 1

Write the following time in 24 hour clock format:

15 minutes after 8.35 a.m.

CORRECT ANSWER

08:50

EDDIE SAYS

Step 1. Begin on the hour at 8:00 am. Step 2. Now add the minutes from the question, 15 + 35 = 50 minutes. Step 3. That would be 8:50am, or 08:50 in 24 hour clock time.

ANSWERS

Question 2

Write the following time in 24 hour clock format:

15 minutes after 8.35 p.m.

CORRECT ANSWER

20:50

EDDIE SAYS

Step 1. Begin on the hour at 8:00 pm. Step 2. Now add the minutes from the question, 15 + 35 = 50 minutes. Step 3. That would be 8:50 pm, or 20:50 in 24 hour clock time.

ANSWERS

Question 3

Write the following time in 24 hour clock format:

15 minutes before 8.35 p.m.

CORRECT ANSWER

20:20

EDDIE SAYS

Step 1. Begin on the hour at 8:00 pm. Step 2. Now subtract the minutes from the question because it says before, 35 - 15 = 20 minutes. Step 3. That would be 8:20 pm, or 20:20 in 24 hour clock time.

ANSWERS

Question 4

Write the following time in 24 hour clock format:

45 minutes before 8.35 p.m.

CORRECT ANSWER

19:50

EDDIE SAYS

Step 1. Begin on the hour at 8:00 pm. Step 2. Now subtract the minutes from the question because it says before, 45 - 35 = 10 minutes before the hour. Step 3. That would be 7:50 pm, or 19:50 in 24 hour clock time.

ANSWERS

Question 5

Write the following time in 24 hour clock format:

45 minutes before 8.05 a.m.

CORRECT ANSWER

07:20

EDDIE SAYS

Step 1. Begin on the hour at 8:00 am. Step 2. Now subtract the minutes from the question, 45 - 5 = 40 minutes. Step 3. That would be 40 minutes before the hour, so 7:20 am, or 07:20 in 24 hour clock time.

ANSWERS

Question 6

Write the following time in 24 hour clock format:

100 minutes before 8.05 a.m.

CORRECT ANSWER

06:25

EDDIE SAYS

Step 1. Begin on the hour at 8:00 am. Step 2. Now subtract the minutes from the question, 100 - 5 = 95 minutes, or 1 hour and 35 minutes. Step 3. That would be 1 hour and 35 minutes before the hour, which is 6:25 am, or 06:25 in 24 hour clock time.

ANSWERS

Question 7

Write the following time in 24 hour clock format:

100 minutes after 8.45 p.m.

CORRECT ANSWER

22:25

EDDIE SAYS

Step 1. Begin on the hour at 8:00 pm. Step 2. Now add the minutes from the question, 100 + 45 = 145 minutes. Step 3. That would be 2 hours and 25 minutes after 8:00 pm, which is 10:25 pm, or 22:22 in 24 hour clock time.

ANSWERS

Question 8

Write the following time in 24 hour clock format:

65 minutes after 10.45 p.m.

CORRECT ANSWER

23:50

EDDIE SAYS

Step 1. Begin on the hour at 10:00 pm. Step 2. Now add the minutes from the question, 65 + 45 = 110 minutes. Step 3. That would be 1 hour and 50 minutes after 10:00 pm, which is 11:50 pm, or 23:50 in 24 hour clock time.

ANSWERS

Question 9

Write the following time in 24 hour clock format:

65 minutes before 10.25 p.m.

CORRECT ANSWER

21:20

EDDIE SAYS

Step 1. Begin on the hour at 10:00 pm. Step 2. Now subtract the minutes from the question, 65 - 25 = 40 minutes. Step 3. That would be 40 minutes before 10:00pm, which is 9:20 pm, or 21:20 in 24 hour clock time.

ANSWERS

Question 10

Write the following time in 24 hour clock format:

75 minutes before 1.05 a.m.

CORRECT ANSWER

23:50

EDDIE SAYS

Step 1. Begin on the hour at 1:00 am. Step 2. Now subtract the minutes from the question, 75 - 5 = 70 minutes. Step 3. That would be 1 hour and 10 minutes before 1:00 am, which is 11:50 pm, or 23:50 in 24 hour clock time.