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How to Calculate Quickly: Full Course in Speed Arithmetic

(Code: 9780486202952)
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How to Calculate Quickly: Full Course in Speed Arithmetic
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. 1945 ed.

Illustrations: -
Author: Sticker
Size: -
Format: Book
Copyright: -
ISBN 13: 9780486202952

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