Focus with addition. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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Focus with addition. Focus secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

Have someone write an addition problem by writing several multi-digit numbers in a column, one below the other. With practice, you will be able to eliminate nines almost as fast as numbers are written out, so that by the end of writing the problem, the digital root of the totality of all numbers will be known to you.

Then you turn your back and ask for the addition. If the viewer now circles one of the result digits (not zero) and names the rest in random order, you can announce the marked digit.

Focus secret:

To do this, you will need to find digital group root digits named by the viewer, and then subtract it from the digital root found at the beginning (you should have memorized it). If the second root is greater than the first, add nine to the first root before subtracting. If the roots turn out to be the same, the marked figure was, of course, a nine.

Author: M.Gardner

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