Short-Cut Math - Softcover

Kelly, Gerard W.

Softcover

ISBN 10: 0486246116 ISBN 13: 9780486246116

Publisher: Dover Publications, 1984

Synopsis

Double or triple your calculation speed! Short-Cut Math is a concise, remarkably clear compendium of timesaving tricks that provide faster, easier ways to add, subtract, multiply, and divide. 
  Easy to understand, get results quickly, save time, no special ability required! 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. 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 Numbers; Simplifying Dividends and Divisors; Fastest Way to Add or Subtract Any Pair of Fractions; Multiplying and Dividing with Mixed Numbers, and more.

The shortcuts 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 shortcut 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.
 

• Whether you're a student, parent, or working professional, getting the right answers in the minimum amount of time is essential. Short-Cut Math provides an arsenal of 150 math short-cuts to make adding, subtracting, multiplying, and dividing a breeze.
• Each method is explained in detail with straightforward language and step-by-step solutions. There's no complicated jargon or formulas to remember. Once you understand the basic principles, you can apply the shortcuts with ease.
• Don't waste time slogging through long drills or exercises. With Short-Cut Math, you can apply each shortcut in minutes and see immediate results.
• You don't need any special math ability to use these shortcuts. They are simple enough for everyone to understand and use.
• Save yourself time and frustration with these fast and easy methods. With just a little practice, you'll be able to solve math problems like a pro!
   

About this title

From the Back Cover

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.

Edition details

• Publisher: Dover Publications
• Publication date: 1984
• Language: English
• ISBN 10: 0486246116
• ISBN 13: 9780486246116
• Binding: Paperback
• Number of pages: 128