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The 24-Hour Clock

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Page 1: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

The 24-Hour Clock

Page 2: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

A day has 24 hours. A clock has 12 hours.This means that every time will happen twice each day.

The 24-Hour Day

half past 9 in the morning half past 9 at night

Page 3: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

We have a few ways to tell the difference between these two times. One way is to use a.m. and p.m.

The 24-Hour Day

a.m. (ante meridiem – before noon)

9:30 p.m.

p.m. (post meridiem – after noon)

9:30 a.m.

Page 4: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

Another way is to use a 24-hour clock.

The 24-Hour Day

21:309:30

Instead of going back to the start after 12, the 24-hour clock carries on until midnight.

The hours after 12 noon are given the numbers 13:00 to 23:00.

A four-digit format is used.Two digits for the hour, a colon (:) and two digits for the minutes.

Page 5: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

This clock and table show the corresponding hours on a 24-hour clock.

The 24-Hour Day

Midnight can be referred to as either

00:00 or 24:00

Page 6: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

To change 12-hour a.m. times to 24-hour times, make sure the time is in a four-digit format. You do not need to write ‘a.m.’

Changing 12-Hour Timesto 24-Hour Times

10:30 a.m. 10:30

2:45 a.m. 02:45

Page 7: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

Change these a.m. times into 24-hour times.

Changing 12-Hour Timesto 24-Hour Times

11:30 a.m.

11:30

6:45 a.m.

06:45

3:15 a.m.

03:15

10:00 a.m.

10:00

Page 8: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

To change 12-hour p.m. times to 24-hour times, add 12 to the hour time. You do not need to write ‘p.m.’

Changing 12-Hour Timesto 24-Hour Times

10:30 p.m. 22:30

3:45 p.m. 15:45

Page 9: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

Changing 12-Hour Timesto 24-Hour Times

10:45 p.m.

22:45

5:30 p.m.

17:30

9:15 p.m.

21:15

7:00 p.m.

19:00

Page 10: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

Changing 12-Hour Timesto 24-Hour Times

5:45 a.m.

05:45

7:30 p.m.

19:30

11:15 a.m.

11:15

1:00 p.m.

13:00

Page 11: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

Changing 12-Hour Timesto 24-Hour Times

5:45 p.m.

17:45

2:15 a.m.

02:15

6:15 p.m.

18:15

10:15 a.m.

10:15

Page 12: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

Here is a TV schedule. The times are written in a 12-hour format. Convert the times to a 24-hour format.

TV Schedule

Page 13: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour time.

Changing 24-Hour Timesto 12-Hour Times

11:15 11:15 a.m.

04:45 4:45 a.m.

Page 14: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

Changing 24-Hour Timesto 12-Hour Times

10:45

10:45 a.m.

07:45

7:45 a.m.

03:15

3:15 a.m.

11:00

11:00 a.m.

Page 15: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

If the hour is between 13 and 23, subtract 12 from the hour and add ‘p.m.’ at the end.

Changing 24-Hour Timesto 12-Hour Times

21:15 9:15 p.m.

13:45 1:45 p.m.

Page 16: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

Changing 12-Hour Timesto 24-Hour Times

22:45

10:45 p.m.

21:30

9:30 p.m.

20:15

8:15 p.m.

14:00

2:00 p.m.

Page 17: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

Changing 24-Hour Timesto 12-Hour Times

05:15

5:15 a.m.

17:30

5:30 p.m.

10:15

10:15 a.m.

15:00

3:00 p.m.

Page 18: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

Changing 24-Hour Timesto 12-Hour Times

06:45

6:45 a.m.

20:45

8:45 p.m.

16:15

4:15 p.m.

08:30

8:30 p.m.

Page 19: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

Here is the bus timetable for the journey from Burnton to Lingley. The times are written in a 24-hour format.

Bus Timetable

Convert the times into a 12-hour format, using a.m. and p.m.

Page 20: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

Sort these times into order from the earliest in the day to the latest.

Time Teasers

04:3011:05 a.m.

16:15

9:00 p.m.quarter to

eight in the morning

half past one in the afternoon

Page 21: The 24-Hour Clock - Amazon Web Services · If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour

Where would you put this clock face into the timeline below?

Time Teasers

04:30quarter to

eight in the morning

11:05 a.m.

half past one in the afternoon

16:15 9:00 p.m.

We do not know if the time shown on the analogue

clock is in morning or the afternoon, so it could go in

either of these places.


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