# Time Arithmetic

## Practise adding, subtracting, multiplying and dividing times with these self-marking exercises.

This is level 5: Mixed. You will be awarded a trophy if you get at least 9 correct and you do this activity online.

Use colons to separate hours and minutes (and seconds in some questions). The time of day can be given in the twenty-four hour format (17:05) or the twelve hour format (5:05pm).

 1 Vanessa’s train leaves at 12:23pm. It takes her half an hour to travel to the station from her home. What is the latest time she should leave home in order to catch her train? ☐ ☐ ✓ ✗ 2 It takes Jasbir ten and a quarter hours to make five dream catchers. How long would it take him to make two dream catchers? ☐ ☐ ✓ ✗ 3 Sak’s flight departs at twenty to five in the afternoon. His flight time is an hour and three quarters. What time does he arrive? ☐ ☐ ✓ ✗ 4 Add the following two times given in hours, minutes and seconds. 2:45:50 and 3:27:48. ☐ ☐ ✓ ✗ 5 Find the difference between the following two times given in hours, minutes and seconds:5:13:25 and 3:22:38. ☐ ☐ ✓ ✗ 6 Find the mean of these times given in hours, minutes and seconds. 1:55:50, 2:45:10 and 3:17:09. ☐ ☐ ✓ ✗ 7 Multiply 2:23:45 by 3. ☐ ☐ ✓ ✗ 8 Divide 12:38:41 by 7. ☐ ☐ ✓ ✗ 9 The running time of a new film is 2:23:30. How many seconds is that altogether? ☐ ☐ ✓ ✗ 10 Louise flies from Bangkok to London. The flight leaves Bangkok at 0645. The journey takes 12 hours 35 minutes. Bangkok time is 6 hours ahead of London time (BST). Find the time in London when she arrives. ☐ ☐ ✓ ✗ 11 Natasha flies from Bangkok to Auckland. The flight leaves Bangkok at 2245. The journey takes 11 hours 10 minutes. Auckland time is 5 hours ahead of Bangkok time. Find the time in Auckland when she arrives. ☐ ☐ ✓ ✗ 12 Aaron has to take some medication nine times each day. The timing of each dose should be equally spaced throughout the day. If he takes his first dose at midnight, what time should he take his eighth dose? ☐ ☐ ✓ ✗
Check

This is Time Arithmetic level 5. You can also try:
Level 1 Level 2 Level 3 Level 4

## Instructions

Try your best to answer the questions above. Type your answers into the boxes provided leaving no spaces. As you work through the exercise regularly click the "check" button. If you have any wrong answers, do your best to do corrections but if there is anything you don't understand, please ask your teacher for help.

When you have got all of the questions correct you may want to print out this page and paste it into your exercise book. If you keep your work in an ePortfolio you could take a screen shot of your answers and paste that into your Maths file.

## More Activities:

Mathematicians are not the people who find Maths easy; they are the people who enjoy how mystifying, puzzling and hard it is. Are you a mathematician?

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#### Connect 4 Factors

A mathematical version of the popular Connect 4 game based on getting four numbers with a common factor in a line. Fun for one, two or a whole class of pupils.

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## Go Maths

Learning and understanding Mathematics, at every level, requires learner engagement. Mathematics is not a spectator sport. Sometimes traditional teaching fails to actively involve students. One way to address the problem is through the use of interactive activities and this web site provides many of those. The Go Maths page is an alphabetical list of free activities designed for students in Secondary/High school.

## Maths Map

Are you looking for something specific? An exercise to supplement the topic you are studying at school at the moment perhaps. Navigate using our Maths Map to find exercises, puzzles and Maths lesson starters grouped by topic.

## Teachers

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## Description of Levels

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Telling the Time - This might be a good place to start if you need help understanding the basics.

Level 1 - Addition

Level 2 - Subtraction

Level 3 - Multiplication

Level 4 - Division

Level 5 - Mixed

Train Timetables - Practise your time arithmetic skills with this real-life application.

More Time Resources including lesson Starters, visual aids, investigations and self-marking exercises.

Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you don’t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.

## Curriculum Reference

See the National Curriculum page for links to related online activities and resources.

## Example

You may also want to use a calculator to check your working. See Calculator Workout skill 12.

Don't wait until you have finished the exercise before you click on the 'Check' button. Click it often as you work through the questions to see if you are answering them correctly. You can double-click the 'Check' button to make it float at the bottom of your screen.

Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you don’t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.

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