Before performing this trick, use soap or Elmer's glue
to put the number 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.
---------------------------------------------Now, take a piece of paper and burn it. Rub the ashes on your forearm to reveal a 17.
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