Worksheets

Welcome to the Math Salamanders 24 Hour Clock Conversion Worksheets.

Here you find our selection of 24 hour time math worksheets to help your child learn
to convert times between the 12 and 24 hour clock.

Quicklinks to ...

In the 24 hour clock, there are no 'am' and 'pm' labels.

The hours start at zero and go throught to 23.

All 24 hour clock times should be written hh:mm or hh:mm:ss, where h is the hour, m is the minute and s is the seconds.

Sometimes the colons are omitted bewteen the hours and minutes.

Converting from 24 hour times to 12 hour times

The following simple steps will help you change a 24 hour time to a 12 hour time with 'am' and 'pm'.

- If the hour is exactly 12, then simply label it as a pm time.
- If the hour is 00, then change it to 12 and label it as an am time.
- If the hour is greater than 12, then simply subtract 12 from the hour and label it as a pm time.
- Otherwise, simply label it as an am time and take away any leading zeros.

The minutes and seconds never change when changing between 24 hour and 12 hour times.

Examples

14:36 = 2:36pm 02:12 = 2:12am

09:24 = 9:24am 17:48 = 5:48pm

00:45 = 12:45am 12:15 = 12:15pm

20:36 = 8:36pm 23:56 = 11:56pm

Converting from 12 hour times to 24 hour clock

The following simple steps will help you change a 12 hour time to a 24 hour time.

- If the hour is exactly 12pm, then simply remove the 'pm' label.
- If the hour is 12am, then change it to 00.
- If the hour is a pm time, then simply add 12 to the hour.
- Otherwise, the hour does not change. If it is less than 10, then add a zero before the digit.

The minutes and seconds never change when changing between 24 hour and 12 hour times.

Examples

1:45am = 01:45 1:45pm = 13:45

4:20am = 04:20 4:20pm = 16:20

11:32am = 11:32 11:32pm = 23:32

12:07am = 00:07 12:07pm = 12:07

These sheets have been split into 3 sections.

The first set of sheets involve converting am and pm times into 24 clock times.

The second set of sheets involve converting 24 hour clock times to 12 hour standard time.

The last set of sheets involve both converting between 12 and 24 hour times and back.

Using these sheets will help your child to:

- convert 12 hour standard times to 24 hour clock times;
- convert 24 hour clock times to 12 hour standard times;
- read from an analogue accurately at 5 minute intervals;
- draw clock hands in the correct place for 5 minute intervals.

Take a look at some more of our worksheets similar to these.

Here you will find our selection of harder time puzzles.

The sheets in this section involve telling the time accurately to 1 minute intervals.

The sheets also include converting 24 hour to 12 hour clock and back.

Each time problem consists of some clues and 8 possible answers, of which only one is correct.

On this page, you will find our military time converter for converting time to and from 24 hour clock.

The converter will convert standard 12 hour times to 24 hour time and also convert 24 hour time to 12 hour standard time.

Looking for an extension activity for children who can already tell the time?

Maybe you want an interesting starter activity for your lesson to get the class thinking?

These printable time puzzles will help to get your child thinking about time and solving problems involving time.

They are good at developing an understanding of the language used in time.

Here you will find our selection of telling time clock worksheets to help your child learn their o'clock, half-past, quarter past and to.

Using these sheets will help your child to:

- read o'clock, half-past times;
- read quarter past and quarter to;
- tell the time to the nearest minute;
- convert analogue times to digital;

The sheets in this section are a great way of starting your child off with learning to tell the time.

These sheets will help you learn to add and subtract hours and minutes from times as well as working out a range of time intervals.

There are also sheets to help you practice adding and subtracting time intervals.

Do you want to know exactly how old you are to the nearest minute?

Have you been alive for more than a billion seconds?

Do you know how many days old you are?

Our online age calculator will tell you all you need to know...

Our quizzes have been created using Google Forms.

At the end of the quiz, you will get the chance to see your results by clicking 'See Score'.

This will take you to a new webpage where your results will be shown. You can print a copy of your results from this page, either as a pdf or as a paper copy.

For incorrect responses, we have added some helpful learning points to explain which answer was correct and why.

We do not collect any personal data from our quizzes, except in the 'First Name' field which is optional. We collect this information so that if a class of students is taking a quiz, the individual results can be recorded along with the first name of the student.

We also collect the results from the quizzes which we use to help us to develop our resources.

For more information on the information we collect, please take a look at our Privacy Policy

If the error message 'File Unavailable' should appear in a pop-up window with a 'RELOAD' option in the bottom right corner of the screen:

- Don't click the RELOAD link - it doesn't do anything
- click anywhere on the screen but not inside the pop-up window
- the pop-up window should disappear and you should be able to see your results.
- NB. This error is a Google error in the Google Quiz app - it is currently unresolved!

We would be grateful for any feedback on our quizzes, please let us know using our Contact Us link, or use the Facebook Comments form at the bottom of the page.

This quick quiz tests your knowledge of reading and converting between 12 and 24 clock times.

We hope you have found our 24 Hour Clock Conversion Sheets useful...please feel free to give us feedback below.

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How to Print or Save these sheets

Need help with printing or saving?

Follow these 3 easy steps to get your worksheets printed out perfectly!

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