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!