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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! 
Explanations and Materials
This mathemagic trick includes an explanatory sheet detailing each step of the trick and revealing the mathematical principles behind it. It can be used to spark curiosity and deepen students' understanding of the concepts involved.

This activity requires some material preparation to enhance the experience:
  • Several cards with digits from 1 to 9
Teacher
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