Three Prime SumA selfmarking challenge to write each of the given numbers as the sum of three prime numbers. 
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.
InstructionsTry 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. 




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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 19 June 'Starter of the Day' page by Nikki Jordan, Braunton School, Devon: "Excellent. Thank you very much for a fabulous set of starters. I use the 'weekenders' if the daily ones are not quite what I want. Brilliant and much appreciated." 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!" 
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Go MathsLearning 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 MapAre 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.  
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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: 
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© Transum Mathematics :: This activity can be found online at:
www.Transum.org/go/?Num=808
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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 selfmarking exercises.
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 doubleclick 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.
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See the National Curriculum page for links to related online activities and resources.