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How to Calculate Quickly: Full Course in Speed Arithmetic

Do you want to double or triple the speed with which you calculate? How to Calculate Quickly is a tried and true method for helping you in the mathematics of daily life—addition, subtraction, multiplication, division, and fractions. The author can awaken for you a faculty which is surprisingly dormant in accountants, engineers, scientists, businesspeople, and […]

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“How to Calculate Quickly: Full Course in Speed Arithmetic”

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