Figuring the Joy of Numbers PDF
Preview Figuring the Joy of Numbers
Shakuntala Devi Figuring Figuring: The Joy of Numbers “There is a range and richness to numbers —they can come alive, cease to be symbols written on a black board, and lead the reader into a world of intellectual adventure where calculations are thrilling.” In Figuring, Shakuntala Devi dramatizes the endless fascination of numbers and their ability to amaze and entertain. She offers easy-to-learn short cuts —how to add long columns in your head, multiply, divide, and find square roots quickly, almost magically. Fractions, decimals, and compound interest become clear and easy to deal with. The author takes delight in working out huge problems mentally—sometimes even faster than electronic computers. In Figuring she shares her secrets with you. Shakuntala Devi shows you a foolproof method to guess your friends’ birthdays and how to determine the day of the week for any date since 1582, and, sublimely ridiculous, she “proves” that 1=2. Puzzle-lovers will enjoy the stories of the wise temple priest who divided 17 elephants in half without bloodshed; the man who will be 3 years older next year than he was the day before yesterday; and the feat of describing each number from 1 through 18 with exactly 4 fours in each equation. Shakuntala Devi has delighted world audiences with her lightning-fast computations and her infectious enthusiasm and love for numbers. No one can read this book without falling under the spell of Figuring and of Ms. Shakuntala Devi. By the same author in Orient Paperbacks Mathability: The Math Genius in Your Child Figuring: The Joy of Numbers " Puzzles to Puzzle You More Puzzles to Puzzle You The Book of Numbers Astrology for You Perfect Murder Awaken the Genius in Your Child FIGURING Tl?e Joyof Nurpber? Sljakuptala Devi Orient® Paperbacks OflHI I MUMBAI I HYOtRABAO ISBN: 978-81-222-0038-6 Figuring: The Jog of Numbers Subject: Mathematics I Recreations & Games © Shakuntala Devi 1st Published 1986 51st Printing 2014 Published by Orient Paperback* (A division of Vision Books Pvt. Ltd.) 5A/8 Ansari Road, New Delhi-110 002 www orientpaperbacks.com Cover design by Vision Studio Printed at Printed in India at Artxel, Noida CONTENTS Introduction 9 1 Some Terms Defined 11 2 The Digits 15 3 Multiplication 31 4 Addition 48 5 Division 52 6 Subtraction 60 7 GCMandLCM 62 8 Squares and Square Roots 68 9 Cubes and Cube Roots 77 10 Percentages, Discounts and Interest 87 11 Decimals 94 12 Fractions 99 13 The Calendar 104 14 Some Special Numbers 112 15 Tricks and Puzzles 131 Conclusion 157 Whatever there is in all the three worlds, which are possessed of moving and non-moving beings, can not exist as apart from the ‘Ganita’ (calculation) Mahavira (ad 850)
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