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For each pair of numbers subtract the sum from the product then divide the result by 20.

Level 1 Level 2 Level 3 Description Help More Arithmetic

This is level 2; Numbers over 30. You can earn a trophy if you get at least 9 correct. You should not use a calculator for this exercise.

31, 35

Correct Wrong

32, 36

Correct Wrong

33, 41

Correct Wrong

36, 43

Correct Wrong

39, 46

Correct Wrong

40, 49

Correct Wrong

42, 47

Correct Wrong

43, 54

Correct Wrong

44, 59

Correct Wrong

47, 47

Correct Wrong

49, 56

Correct Wrong

52, 66

Correct Wrong


This is MASAD level 2. You can also try:
Level 1 Level 3


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.

This web site contains over a thousand free mathematical activities for teachers and pupils. Click here to go to the main page which links to all of the resources available.

Please contact me if you have any suggestions or questions.

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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?

Comment recorded on the 10 April 'Starter of the Day' page by Mike Sendrove, Salt Grammar School, UK.:

"A really useful set of resources - thanks. Is the collection available on CD? Are solutions available?"

Comment recorded on the 2 April 'Starter of the Day' page by Mrs Wilshaw, Dunsten Collage,Essex:

"This website was brilliant. My class and I really enjoy doing the activites."

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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.


If you found this activity useful don't forget to record it in your scheme of work or learning management system. The short URL, ready to be copied and pasted, is as follows:

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Description of Levels



Level 1 - Numbers between 1 and 40

Level 2 - Numbers over 30

Level 3 - Numbers over 60


The sum of two numbers is the total you get when you add the numbers together.

The product of two numbers is the total you get when you multiply the numbers together.

Subtract means take away!

Dividing by twenty is a lot to ask,

But an easier method will help you.

Dividing by ten is a much easier task,

Then divide your answer by two!

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.