How to Calculate Quickly: Full Course in Speed Arithmetic

Henry Sticker


Dover Publications | 1955 | 185 páginas | Djvu | 2,4 Mb

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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.