Before performing this trick, use soap or
Elmer's glue to put 17 on your hand or forearm.

1. Have your students write down any 2 digit number from 31 to 99.

2. Add 82.

3. Cross out the hundreds digit and add it to the remaining two digits.

4. Subtract this from your original number.

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Now, take a piece of paper and burn it. Rub the ashes on your forearm to reveal a 17.

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