don steward
mathematics teaching 10 ~ 16

Sunday, 19 April 2009

number tic tac toe

one player has the odd numbers 1 to 9 and goes first
the other has the even numbers 2 to 8

people take turns playing a digit, trying to make a row or column or diagonal add to 15 - using their own and the other person's numbers

sometimes you can make more than one line that sums to 15

you get a point every time you obtain a total of 15

play five games being the odds player and five being the evens
is there any advantage to either?

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