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  • Number
  • Primes, Factors and Divisibility
  • The Fabulous Fractal Factory
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  • Diversions
  • Origami
  • Puzzle of the Day
  • Fractions
  • Online Stories

Puzzle of the Day

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

Start with a three-digit number and repeat the digits to make a six-digit number, for instance 379379. Now divide by 7, then divide the answer by 11 and then divide this answer by 13. What do you notice? Does it always happen?

Answer: Always reduces to the original.