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  • Number
  • Primes, Factors and Divisibility
  • The Fabulous Fractal Factory
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  • Puzzle of the Day
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Puzzle of the Day

These puzzles are also printed in Eight days a week, a booklet published by 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