don steward
mathematics teaching 10 ~ 16

Tuesday, 15 February 2011


Place the digits 2 to 7 (used once only) in the circles.
Multiply in pairs to get the nine products in the table.
Add these nine products.

How do you place the six digits to get the highest possible total?
[The maximum is 182. How is this maximum achieved?]

All of the row (and column) totals divide by a certain number (other than 1). Why is this?

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