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Year 5 Maths

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Twenty-Four Hour Clock

You know that there are twenty-four hours in each day. When we tell the time, we can think of the twelve hours before noon ( AM ) and the twelve after noon ( PM ). We can also use the 24-hour clock that we learnt about in Year 4.

In 24-hour time, we say hours and minutes rather than minutes past or to each hour:

24 hour clock

If it is afternoon, we add twelve to the hours, so it is the number of complete hours since midnight.

13:00, not 1 PM . You say ‘Thirteen hundred’.

18:55, not five to seven in the evening. You say ‘Eighteen fifty-five’.

If it is before ten in the morning, we start with a zero, calling it ‘O’ like the letter O.

08:35 for twenty-five to nine in the morning. You say ‘O eight thirty-five’.

00:15 for quarter past midnight. You say ‘O O fifteen’.

12:15 for quarter past midday. You say ‘Twelve fifteen’.

Most digital clocks show you the last whole minute, not the nearest minute, even if it is only a second until the next minute starts. If you are meeting someone at 15:00 and the clock says 14:59, you may have a whole minute or you may have only a second.

Write each of these times as they would appear on the face of a digital, twenty-four hour clock:

Half past nine in the morning.
Ten minutes to midday.
Twelve minutes past four in the afternoon.
2 PM
Quarter past seven in the evening.


This activity is adapted from pages 265-266 of What Your Year 5 Child Needs to Know, which can be purchased here.