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Speed Mathematics: Secrets of Lightning Mental Calculation
by Bill Handley
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Amazon.com Product Description (ISBN 0471467316, Paperback)Using this book will improve your understanding of math and have you performing like a genius!
People who excel at mathematics use better strategies than the rest of us; they are not necessarily more intelligent.
Speed Mathematics teaches simple methods that will enable you to make lightning calculations in your head-including multiplication, division, addition, and subtraction, as well as working with fractions, squaring numbers, and extracting square and cube roots. Here's just one example of this revolutionary approach to basic mathematics:
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
It's that easy!
(retrieved from Amazon Thu, 12 Mar 2015 18:09:13 -0400)
"This is a revised edition of Speed Mathematics with three new chapters of maths strategies for maths enthusiasts."--Provided by publisher.
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