Morning and afternoon
8:15 am is in the morning. 15:15 is the same time in 24-hour form for 3:15 pm.
For afternoon times, the hour is more than 12 in 24-hour time.
Year 3
Tell and write the time from 12-hour and 24-hour clocks
Match times between 12-hour wording and 24-hour notation.
Lesson overview
Time
A 12-hour clock uses am and pm to show morning and afternoon or evening times. A 24-hour clock counts on from midnight to 23:59 without using am or pm.
Match the same time
07:05 and 7:05 am name the same time.
Leading zeroes are common in 24-hour time.
Use a clock face too
Analogue and digital forms can show the same time.
3:15 pm or 15:15
The hands help us see the same time in another format.
Worked example
Write 6:40 pm in 24-hour time.
- 6:40 pm is in the evening.
- For pm times after midday, add 12 to the hour.
- 6 + 12 = 18.
- So the 24-hour time is 18:40.
Try it
Decide whether the time is am or pm, then match it to the 24-hour format carefully.
Question 1
What is 3:20 pm in 24-hour time?
Question 2
What is 07:45 in 12-hour time?
Question 3
Write the 24-hour hour number for 8:10 pm.
Question 4
Which pair shows the same time?
Question 5
Which statement is correct?
Common mistakes
Watch for these when working through the lesson.
- Forgetting to add 12 for afternoon and evening times.
- Using am and pm with a 24-hour time.
- Changing the minutes when only the hour form should change.
Related topics
These ideas fit closely with this lesson.
- Tell and write the time from an analogue clock, including using Roman numerals from I to XII.
- Estimate and read time with increasing accuracy to the nearest minute.