Henry Sticker, “How to Calculate Quickly: Full Course in Speed Arithmetic” (Download for FREE)



1955 | ISBN: 1607964201, 048620295X | 185 pages | PDF | 5 MB

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.

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Also numerous helpful short cuts. More than 8,000 problems, with solutions.

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