Write on paper the number 12345679 (Attention, missing 8 )

Ask a friend to tell you a number from 1 to 9.

Mentally multiply it by 9 writes the result under number 12345679 and ask your friend to multiply the two numbers .

You will be amazed of the result.

Put on the table a sealed envelope , a paper and a pen.

Ask a friend to write on paper any three-digit number , for example 528.

Ask him to write this issue with inverted numbers in our example 825 and subtract the least senior , 825-528 = 297 .

and finally to add the digits of the number obtained , 2 + 7 + 9 = 18 .

Then open the envelope and pulls out a paper put before closing with " The number obtained is 18 "

Which as you know?
The result is always 18 , only a precaution , the initial number can not be palindromic , by making the subtraction would result 0.

Put one on top of the table and asked to write this time a 4-digit number , eg 2536

Below that number to enter another with the same digits but in a different order , for example 3265 .

You subtract the least senior , 3265-2536 = 729 and adding up the digits of the number obtained , 7 + 2 + 9 = 18 .

If the result is a two-digit number that join each 1 + 8 = 9.

Opens the envelope and pulls out the paper where you wrote " The number obtained is 9 "
Surprised?

###### By Felipe Márquez.

Think about the number of times a week that you would like to go dining out

Multiply by 2 and add 5

Multiply by 50