A game for two players who take turns to select two numbers that add up to a prime number. 
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Enter the names of the players.
Player 1:
Player 2:
StartEach adjacent pair of numbers on the line must add up to a prime number.
THE LINE


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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 23 September 'Starter of the Day' page by Judy, Chatsmore CHS: "This triangle starter is excellent. I have used it with all of my ks3 and ks4 classes and they are all totally focused when counting the triangles." 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!" 


Numeracy"Numeracy is a proficiency which is developed mainly in Mathematics but also in other subjects. It is more than an ability to do basic arithmetic. It involves developing confidence and competence with numbers and measures. It requires understanding of the number system, a repertoire of mathematical techniques, and an inclination and ability to solve quantitative or spatial problems in a range of contexts. Numeracy also demands understanding of the ways in which data are gathered by counting and measuring, and presented in graphs, diagrams, charts and tables." Secondary National Strategy, Mathematics at key stage 3 

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There are 385072 ways of arranging the numbers 1  18 in a circle so that the sum of each pair of adjacent numbers is prime. Here is one of the possible ways
1,6,5,2,3,10,9,8,11,12,17,14,15,16,7,4,13,18.
See Math Forum for a discussion of PrimeSum Circles.
See Bernardo Recamán’s Primes in a Circle Puzzle.
See Scallywags and Scoundrels for a puzzle requiring the numbers 1  12 to be arranged in a PrimeSum Circle.
See Square Pairs Game for a similar game involving square numbers.
See Square Pairs for the related lesson Starter.
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