Quick Calculations Mental Arithmetic

There are several methods whereby the Mentalist can render an impressive demonstration of his ability by a show of rapid calculations. The business of mentally squaring or cubing a number, or extracting the square or cube root can cause quite a stir amidst intelligent people.

(I) Squaring

Since it is very easy to square small numbers in the head we shall not bother to deal with anything under twenty-five. Most people, having to square say 15—could do so with little trouble. However, dealing with numbers from twenty-five and up to a hundred (which is more than enough):—

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