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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. 99 x 99, 999 x 999, 9999 x 9999, etc.

Answer: Answer has one less nine than started with, then an 8, then the same number of zeros as the nines started with, then a 1


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