# No Partner

Find pairs of numbers that add up to:

### 99

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.

36, 12, 91, 87, 13, 22, 43, 77, 41, 71, 18, 72, 81, 63, 40, 86, 59, 56, 28, 32, 27.

Most of the numbers in the list above can be added to another number in the list to give a sum of 99 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:

### 48

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

31, 23, 39, 38, 21, 27, 40, 18, 30, 46, 8, 16, 11, 41, 2, 37, 7, 17, 3, 45, 9.

Most of the numbers in the list above can be added to another number in the list to give a sum of 48 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:

### 91

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

5, 44, 61, 9, 23, 56, 82, 86, 21, 47, 89, 35, 4, 70, 68, 38, 30, 53, 2, 65, 42.

Most of the numbers in the list above can be added to another number in the list to give a sum of 91 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:

### 90

74, 8, 30, 34, 6, 82, 28, 9, 16, 60, 76, 10, 4, 62, 80, 81, 56, 3, 86, 87, 22.

Most of the numbers in the list above can be added to another number in the list to give a sum of 90 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.

## 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 9 April 'Starter of the Day' page by Jan, South Canterbury:

"Thank you for sharing such a great resource. I was about to try and get together a bank of starters but time is always required elsewhere, so thank you."

Comment recorded on the 1 February 'Starter of the Day' page by M Chant, Chase Lane School Harwich:

"My year five children look forward to their daily challenge and enjoy the problems as much as I do. A great resource - thanks a million."

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#### Strategy Games

We have collected together lots of strategy games for you to enjoy. Many of them have mathematical principles involved in their design so would make a good activity for a Mathematics lesson.

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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:

Alternatively, if you use Google Classroom, all you have to do is click on the green icon below in order to add this activity to one of your classes.

It may be worth remembering that if Transum.org should go offline for whatever reason, there is a mirror site at Transum.info that contains most of the resources that are available here on Transum.org.

When planning to use technology in your lesson always have a plan B!

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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