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.
4 Quick and Easy Math wrong? If better and quicker methods exist, why weren't they taught in school? School methods, of course, are not wrong; but usually they are longer than they have to be. For this there are two reasons.
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