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.

5, 10, 9, 22, 53, 59, 65, 48, 66, 14, 68, 26, 31, 45, 11, 57, 74, 18, 13, 34, 70.

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)?

Correct Wrong Correct Wrong Correct Wrong

 

Find pairs of numbers that add up to:

49

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

10, 3, 9, 44, 32, 37, 21, 28, 27, 48, 14, 13, 17, 36, 4, 39, 5, 45, 1, 22, 40.

Most of the numbers in the list above can be added to another number in the list to give a sum of 49 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)?

Correct Wrong Correct Wrong Correct Wrong

 

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?

12, 73, 3, 75, 65, 26, 79, 7, 16, 78, 5, 8, 18, 68, 80, 11, 33, 86, 23, 83, 88.

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)?

Correct Wrong Correct Wrong Correct Wrong

 

Find pairs of numbers that add up to:

80

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

76, 4, 25, 32, 15, 17, 67, 14, 7, 66, 56, 63, 48, 11, 73, 35, 55, 6, 69, 24, 45.

Most of the numbers in the list above can be added to another number in the list to give a sum of 80 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)?

Correct Wrong Correct Wrong Correct Wrong

 

 

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.

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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 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."

Comment recorded on the 28 May 'Starter of the Day' page by L Smith, Colwyn Bay:

"An absolutely brilliant resource. Only recently been discovered but is used daily with all my classes. It is particularly useful when things can be saved for further use. Thank you!"

Featured Activity

Vinculum

Vinculum

This activity comprises of five challenges each one requiring you to type in one more fraction than the previous challenge and each starting with a different fraction. The starting fractions are one tenth, one quarter, one third, one half and four sevenths.

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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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