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School & Library Binding
Can you multiply 362 x .5 quickly in your head? Could you readily calculate the square of 41? How much is 635 divided by 2½? Can 727,648 be evenly divided by 8?
If any of these questions took you more than a few seconds to solve, you need this book. Short-Cut Math is a concise, remarkably clear compendium of about 150 math short-cuts—timesaving tricks that provide faster,e asier ways to add, subtract, multiply, and divide.
By using the simple foolproof methods in this volume, you can double or triple your calculation speed—even if you always hated math in school. Here's a sampling of the amazingly effective techniques you will learn in minutes: Adding by 10 Groups; No-Carry Addition; Subtraction Without Borrowing; Multiplying by Aliquot Parts; Test for Divisibility by Odd and Even Nunmbers; Simplifying Dividends and Divisors; Fastest Way to Add or Subtract Any Pair of Fractions; Multiplying and Dividing with Mixed Numbers . . . and more.
The short-cuts in this book require no special math ability. If you can do ordinary arithmetic, you will have no trouble with these methods. There are no complicated formulas or unfamiliar jargon—no long drills or exercises. For each problem, the author provides an explanation of the method and a step-by-step solution. Then the short-cut is applied, with a proof and an explanation of why it works.
Students, teachers, businesspeople, accountants, bank tellers, check-out clerks—anyone who uses numbers and wishes to increase his or her speed and arithmetical agility, can benefit from the clear, easy-to-follow techniques given here.
I thought it was a good book and will use it with my grandson for years to come.
It is okay but not great, as the organization was not very convenient, and it was hard for my ten-year-old to understand in places.
If you are like me, doing most of your math through computers, you may find the need to go back and brush up on the fundamentals.
Buy this book. Admittedly, this is not a book you read from cover to cover from page one through to page 109, especially if you have a dyslexic mind like my own. Read morePublished 1 month ago by sadface
Breaks down the concepts nicely. Makes math fast. I'm an engineer and no slouch at math, but am much faster with these skills.Published 2 months ago by Casey Caster
A pretty good book - it points out some cool things about math I had never thought about. Some of the content was not that much of a shortcut, but overall I think it is worth the... Read morePublished 7 months ago by E123