New Math magic trick

[bickio]

Hi everybody,
Today I came up with a very very simple trick:

think of any 2 digit number.

subtract from this number the sum of it's digits.

Add all the digits of this new number together.

I know your answer.

What do you think?

Bickio

 

[RealityOne]

Well, it isn't new, but fun nonetheless. There are lots of card trick and other effects based on similar principles -- especially taking a number and subtracting from it the inverse and then adding the digits (92-29=63; 6+3=9). A similar result is used in the 10 to 20 force that I learned from Mark Wilson's book.

 

[bickio]

Oh ok,
It's always slightly disappointing when you find out your discovery is not original.

thanks,
Bickio