NRICH: Odd Tic Tac

An odd version of tic tac toe

Age 5 to 7

Odd Tic Tac is another game for two players similar to Tic Tac Toe. Find out if the strategies for play are the same. Using a 3 by 3 grid, one player writes O’s and the other 1’s taking it in turns. To win you have to complete a line with an odd total.

Now play the game against the computer. Can you beat the computer?

Addition & Subtraction, Types of Numbers (Odd, Even, Prime, Composite)

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NRICH (University of Cambridge)

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Board/Card Game

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