Morning, Evening and 24-Hour Time: Set One

Name the same time in two ways. Keep the minutes and check which part of the day is meant.

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A 24-hour clock uses hours 00 through 23. For a.m., keep hours 1-11 but change 12 to 00. For p.m., add 12 to hours 1-11 but keep 12. Keep both minute digits. We write noon as 12:00 and midnight at the start of a named date as 00:00. These examples use one time zone with no clock changes.

Worked example

6:40 p.m. is 18:40 because 6 + 12 = 18. Going back, 18 - 12 = 6, so 18:40 is 6:40 p.m. Monday 23:55 to Tuesday 00:05 is ten minutes, not a whole day.

Given time labels: A, 6:25 p.m.; B, 04:40; C, 12:15 a.m.; D, 12:15 p.m. — These are the given times. Write a different name for the same time.

Would you believe it?

From 2:00 to 3:00 on a twelve-hour clock, the minute hand makes one full turn, passing twelve number-to-number spaces. The hour hand moves through only one such space, from 2 to 3.

Question 1 Write A, 6:25 p.m., using a 24-hour clock. 06:25 18:25 18:52

Question 2 Write B, 04:40, using a.m. or p.m. 4:40 p.m. 12:40 a.m. 4:40 a.m.

Question 3 Write C, 12:15 a.m., using a 24-hour clock. 00:15 12:15 24:15

Question 4 Write D, 12:15 p.m., using a 24-hour clock. 00:15 24:15 12:15

Question 5 In the same time zone, with no clock change, how long is Wednesday 23:50 to Thursday 00:10? 20 minutes 40 minutes 24 hours

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