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 25 June 'Starter of the Day' page by Inger.kisby@herts and essex.herts.sch.uk, : "We all love your starters. It is so good to have such a collection. We use them for all age groups and abilities. Have particularly enjoyed KIM's game, as we have not used that for Mathematics before. Keep up the good work and thank you very much Comment recorded on the 19 October 'Starter of the Day' page by E Pollard, Huddersfield: "I used this with my bottom set in year 9. To engage them I used their name and favorite football team (or pop group) instead of the school name. For homework, I asked each student to find a definition for the key words they had been given (once they had fun trying to guess the answer) and they presented their findings to the rest of the class the following day. They felt really special because the key words came from their own personal information." 


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 

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 main page links to more activities designed for students in upper Secondary/High school. TeachersIf 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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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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