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math mentalism

Make a prediction.
Choose any number between 1 and 100. 
Add 28. 
Multiply by 6.
Subtract 3. 
Divide by 3. 
Subtract the original number plus 3.
Add 8. 
Subtract the original number minus 1. 
Multiply by 7.
Look at prediction.  (PDF is here)

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PS :  Try this nine card trick.

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