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The Thief

A digit was stolen! Do you think the magician will be able to get it back?

Is it possible to find a digit that was stolen? Sure, when you know how! Can you figure it out?

This great trick is based on a basic mathematical concept used in arithmetic, but in a surprising way! Once you understand how to perform the trick, you can make it even more spectacular by using bigger numbers. But no more hints, otherwise the magic would disappear! 

  • This trick is performed using the divisibility rule for 9. Although this rule is taught at the beginning of high school, it is not easy to apply in this trick. Therefore, understanding this trick is difficult but achievable if the divisibility rule has been assimilated.

  • Planning notes