How to Calculate Quickly: Full Course in Speed Arithmetic (Dover Books on Mathematics)
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How to Calculate Quickly: Full Course in Speed Arithmetic (Dover Books on Mathematics), Larry Gonick, 9780486202952
In stock
Many useful procedures explained and taught: 2-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 edition.
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