 Card Tricks
 Number Tricks

The Power of 3
Grade level: 610
Difficulty level: Medium
 Volunteers from the audience write three numbers from 1 to 9 on a board.
 They multiply each of these numbers by 3 and record the products.
 Then they multiply each digit in the result of the previous step by 3 and again record the products.
 They cross out one digit from the result of the previous step and add up the rest the digits.
 The magician is told the value of the sum and names the crossed out digit.
Detailed description
