Posted on 2010-08-15. By anonymous.
Speed math; literally. Simple stuff on how to do mathematical operations (addition, subtraction, division, multiplication) in a simplified manner. Fractions, squaring numbers, and extracting square/cube roots included.
Example: 96 x 97 = ?
96 x 97 =
Subtract each number from 100
96 x 97 =
Subtract diagonally. Either 96 - 3 or 97 - 4
The result is the first part of the answer
96 x 97 = 93
Multiply the numbers in the circles. 4 x 3 = 12
This is the second part of the answer
96 x 97 = 9312
Speed Mathematics by Bill Handley
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