This book contains many useful procedures explained and taught - two-column addition, left-to-right subtraction, direct multiplication by numbers greater than 12, mental division of large numbers, more. Also numerous helpful short cuts. More than 8,000 problems, with solutions.
HOW TO CALCULATE QUICKLY - FULL COURSE IN SPEED ARITHMETIC
HENRY STICKER
Dover
1955
186 páginas
6h 12m
ISBN-10: 048620295x
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