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These puzzles are also printed in Eight days a week, a booklet published by the Association of Teachers of Mathematics.The Association of Teachers of Mathematics

Try these on a calculator then predict what the next in the pattern will be when your calculator display is not big enough. 11 x11, 111 x 111, 1111 x 1111, etc.

Answer: 111111111x111111111=1234567898765432


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