Transcription of Quick and Easy Math - Arvind Gupta
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Quick and Easy Math - Arvind Gupta
Quick and easy math To copyreaders everywhere who deserve so much credit and get so little FOURTH PRINTING C COPYRIGHT 1964 BY lSAAC ASIMOV ALL lUGHTS lIESERVEO INCLUDlNG THE IUGHT TO l\El'RODUCE '!HIS JIOOI:: OIl PARTs 'tHEREOF IN ANY FORM LIBRARy OF CONGRESS CATALOG CAIro NlJMlIJ::R: 64-12216 ;PRINTED IN THE U. s. A. ~ CONTENTS 1 Why Shortcuts? 1 2 Addition 7 Naming the Parts of Addition 7 carrying 10 adding Left to Right 14 Round Numbers 22 Checking Addition 26 3 Subtraction 35 Addition in Reverse 35 Checking Subtraction 41 4 Multiplication 45 The Multiplication Table 45 Beyond the Multiplication Table 50 Making the Multiplier a Sum 55 Doubling 62 Checking Multiplication 67 5 Division 71 The Perils of DiviSion 71 Divisibility by 2,5, and 10 75 Divisibility by 4 and 8 78 Divisibility by 3, 6, and 9 84 Other Divisibilities 88 The Division Table 94 Rewriting Divisions 98 Long Division 102 Checking Division 109 6 Decimals 112 Zeros in Reserve 112 Freeing the Decimal Point 118 Manipulating Decimals 122 Simplifying by DecimGl 132 DoU(lrs and Cents 139 Percentage 142 Checking the Decimal Point 147 The Uses of Approximation 153 7 Fractions 159 Manipulating Fractions 159 Fractions and Decimals 163 M ultipliootion of Fractions 168 Fractions a)
CONTENTS 1 Why Shortcuts? 1 2 Addition 7 Naming the Parts of Addition 7 Carrying 10 Adding Left to Right 14 Round Numbers 22 Checking Addition 26 3 Subtraction 35 Addition in Reverse 35 Checking Subtraction 41 4 Multiplication 45 The Multiplication Table 45 Beyond the Multiplication Table 50
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