don steward
mathematics teaching 10 ~ 16

Tuesday, 9 November 2010



put some numbers in the boxes so that each of the four blocks of four sum to 10
for example:

what happens when you add the four corner numbers of a resulting (3 by 3) square?

why must this total must always be even (for integer entries)?

in the last, incomplete, example why must the bottom right cell be the same as the top left cell?

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