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Recurring Number

.
Write down the following 8 digit number on a piece of paper: 1 2 3 4 5 6 7 9

Ask a participant to circle one of the digits.
Example : the participant circles number 7.

Now ask the participant to multiply the 8 digit number by 63.

A magic result happens :
1 2 3 4 5 6 7 9 x 6 3  =  7 7 7 7 7 7 7 7 7
The answer is a row of the chosen number 7.

How to do this math trick:
When the participant circles a number, you need to multiply the chosen number by 9.
Example: if 3 was chosen you would multiply 3 x 9 = 27.
Then you would ask the participant to multiply the 8 digit number by the number you obtained (27)

Therefore  multiply 12345679 by 27 and you magically get the answer 333333333.

Einstein would be proud!



Math Tricks