# No Partner

Find pairs of numbers that add up to:

### 45

You can click on the pairs to hide them. When you have clicked on all the pairs the three numbers with no partner will remain.

13, 27, 10, 36, 25, 6, 30, 41, 15, 12, 32, 35, 34, 20, 9, 37, 4, 38, 8, 18, 11.

Most of the numbers in the list above can be added to another number in the list to give a sum of 45 but three numbers do not have a partner. Can you find those three numbers and type them into the boxes below in order of size (smallest first)?

Find pairs of numbers that add up to:

### 51

If you make a mistake you can click on a hidden number to make it reappear. If you reload this page all of the numbers will change

7, 19, 13, 20, 5, 16, 4, 38, 2, 10, 30, 32, 21, 31, 42, 49, 46, 47, 40, 11, 35.

Most of the numbers in the list above can be added to another number in the list to give a sum of 51 but three numbers do not have a partner. Can you find those three numbers and type them into the boxes below in order of size (smallest first)?

Find pairs of numbers that add up to:

### 58

Are there any quick ways of spotting the pairs? Could you start by just looking at the units digit of each of the numbers?

37, 3, 10, 31, 48, 7, 51, 54, 27, 5, 21, 53, 57, 18, 6, 23, 25, 52, 1, 35, 40.

Most of the numbers in the list above can be added to another number in the list to give a sum of 58 but three numbers do not have a partner. Can you find those three numbers and type them into the boxes below in order of size (smallest first)?

Find pairs of numbers that add up to:

### 65

You can feel pleased with yourself for completing this online exercise. Claim your Transum Trophy after checking your answers.

36, 26, 47, 30, 42, 27, 60, 23, 37, 21, 56, 39, 44, 18, 38, 31, 28, 5, 9, 35, 10.

Most of the numbers in the list above can be added to another number in the list to give a sum of 65 but three numbers do not have a partner. Can you find those three numbers and type them into the boxes below in order of size (smallest first)?

## 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.

## Transum.org

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.

## 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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I love you website I use it every maths lesson I have with every year group! I don't know were I would turn to with out you!"

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#### Digital Darts

An online darts game for one or two players requiring skill, strategy and mental arithmetic. It provides an enjoyable way to practise adding and subtracting two and three digit numbers.

## Answers

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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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