Transum Software

Three Prime Sum

A self-marking challenge to write each of the given numbers as the sum of three prime numbers.

Level 1 Level 2 Level 3 Level 4 Level 5 Description Help More...

For each challenge below type three prime numbers into the spaces that add up to the target number. The three primes do not necessarily all need to be different. You will be awarded a trophy if you get at least 7 correct and you do this activity online.

8

= + + Correct Wrong

11

= + + Correct Wrong

13

= + + Correct Wrong

16

= + + Correct Wrong

18

= + + Correct Wrong

22

= + + Correct Wrong

25

= + + Correct Wrong

28

= + + Correct Wrong

32

= + + Correct Wrong

Check

This is Three Prime Sum level 1. You can also try:
Level 2 Level 3 Level 4 Level 5

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.

Why am I learning this?

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 24 May 'Starter of the Day' page by Ruth Seward, Hagley Park Sports College:

"Find the starters wonderful; students enjoy them and often want to use the idea generated by the starter in other parts of the lesson. Keep up the good work"

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."

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It is a race against the clock to answer 30 mental arithmetic questions. There are nine levels to choose from to suit pupils of different abilities.

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

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.

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

Curriculum Reference

See the National Curriculum page for links to related online activities and resources.

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© Transum Mathematics :: This activity can be found online at:
www.Transum.org/go/?Num=808

Description of Levels

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Level 1 - Find three prime numbers that add up to totals between 6 and 32

Level 2 - Find three prime numbers that add up to totals between 33 and 59

Level 3 - Find three prime numbers that add up to totals between 60 and 86

Level 4 - Find three prime numbers that add up to totals between 87 and 113

Level 5 - Find three prime numbers that add up to totals between 114 and 140

This exercise is based on the Goldbach Conjecture - every integer greater than 5 can be written as the sum of three prime numbers, such as 25 = 11 + 7 + 7

More 'Number' activities including lesson Starters, visual aids, investigations and self-marking exercises.

Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you don’t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.

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Help

The video above is from the wonderful Corbettmaths.

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. You can double-click the 'Check' button to make it float at the bottom of your screen.

Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you don’t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.

Log in Sign up

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