Converting a 12 Hour Clock Time Into a 24 Hour Clock Time. Primary or Elementry Math Help

In this article you will be taught how to convert 12 hour clock to 24 hour clock. For example, if a time in 12 hour clock is 2.45pm then in 24 hour clock the time will be 14.45. Ideal for elementary (primary) school children.

Changing a time from 12 hour clock times to 24 hour clock times can be quite tricky if you don’t know how.  For times that are in the morning (am times) all you need to do is take the am off the end of the number and make the number a 4 digit number by adding a zero before the hours. For times in the afternoon (pm times) all you need to do is add 12 onto the hours part of the number and remove the pm.

However there are a couple of exceptions to the above rule. If the time is between 12am and 1am change the 12 to 00. Also, if the time is between 12pm and 1pm don’t change anything except for taking off the pm.

Let’s look at some examples on changing 12 hour clock times to 24 hour clock times.

Example 1

Change 6.15 am to 24 hour clock time.

This is a morning time, so add a zero before 6 and remove the am

6.15am = 06.15

Example 2

Change 10.32 pm to 24 hour clock time.

This is an afternoon time, so add 12 onto the hours.

10.32pm = 22.32

Example 3

Change 1.49 pm to 24 hour clock time.

This is an afternoon time again, so add 12 onto the hours.

1.49 pm = 13.49

Example 4

Change 12.25 pm to 24 hour clock time.

This is afternoon time, but between 12pm and 1pm so keep the time the same!

12.25pm = 12.25

Example 5

Covert 12.05am to 24 hour clock time.

This is morning time, but between 12am and 1am so change the 12 into 00.

12.05 = 00.05

For some more conversions on changing between 12 hour clock and 24 hour clock click here.

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