The 24 hr clock has a different number for each hour of the day. 

The 24 hr clock runs from 00 =>00 to 23 =>59

To change from 24 hr time to normal 12 hr, we subtract 12 from the hours it is after 12 =>59pm. To change from 12 hr time to 24 hr time, we add 12 to the hours it is after 12 =>59pm.

If it is before and a single digit we have to add a ‘0’ to the beginning of the number. (12 =>00 to 12 =>59 is 00 =>00 to 00 =>59)

Now try a few practice questions!