# No Partner

Find pairs of numbers that add up to:

### 79

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.

3, 77, 25, 69, 2, 67, 7, 5, 54, 15, 33, 76, 64, 65, 12, 43, 66, 72, 14, 36, 10.

Most of the numbers in the list above can be added to another number in the list to give a sum of 79 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:

### 66

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

34, 51, 6, 3, 15, 36, 24, 55, 31, 32, 23, 60, 63, 11, 43, 42, 30, 44, 28, 29, 35.

Most of the numbers in the list above can be added to another number in the list to give a sum of 66 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:

### 71

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

62, 20, 23, 22, 42, 49, 54, 30, 57, 29, 63, 10, 17, 39, 41, 8, 32, 38, 14, 33, 51.

Most of the numbers in the list above can be added to another number in the list to give a sum of 71 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:

### 70

28, 26, 20, 50, 37, 44, 42, 49, 51, 8, 68, 6, 33, 54, 2, 62, 19, 21, 39, 16, 32.

Most of the numbers in the list above can be added to another number in the list to give a sum of 70 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.

## 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?

Comment recorded on the 17 June 'Starter of the Day' page by Mr Hall, Light Hall School, Solihull:

"Dear Transum,

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!"

Comment recorded on the 12 July 'Starter of the Day' page by Miss J Key, Farlingaye High School, Suffolk:

"Thanks very much for this one. We developed it into a whole lesson and I borrowed some hats from the drama department to add to the fun!"

#### Four Colour Theorem

This mathematical activity involves colouring in! That makes a change. Using the paint bucket tool can you flood fill the regions so that no two adjacent regions are the same colour?

There are answers to this exercise but they are available in this space to teachers, tutors and parents who have logged in to their Transum subscription on this computer.

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Subscribers can manage class lists, lesson plans and assessment data in the Class Admin application and have access to reports of the Transum Trophies earned by class members.

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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

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:

Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for those learning Mathematics anywhere in the world. Click here to enter your comments.

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