Australia
Year 5
6.02 24 hr time
Lesson
Are you ready?
How many hours are displayed on a clock? How many hours are in a day?
Idea summary
12 hours are displayed on a clock, but there are 24 hours in a day.
Since 12 goes into 24 \, \, 2 times, the hour hand will go around a clock 2 times in a day.
12 and 24 hour time
This video explores how a 24 hour clock works and demonstrates how to switch between 12 and 24 hour time.
Examples
Example 1
Convert 3\text{:}41 pm into 24-hour time.
Worked Solution
Idea summary
To convert 12-hour pm time to 24-hour time, we add 12 to the number of hours.
We don't express midnight as 24\text{:}00 using the 24 hour clock, instead, we write 00\text{:}00 as it's the start of the day. When using the 12 hour clock, we write midnight as 12\text{:}00 AM.