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Spending five to ten minutes per day on this book will double or triple your calculation speed within ten weeks!
How to Calculate Quickly is a tried and true method for helping you with the mathematics of daily life — addition, subtraction, multiplication, division, and fractions.
The author can awaken for you a faculty that is surprisingly dormant in accountants, engineers, scientists, businesspeople, and others who work with figures. This is "number sense" — the ability to recognize relations between numbers considered as whole quantities. Lack of this number sense makes it entirely possible for a scientist to be proficient in higher mathematics, but get bogged down in the arithmetic of everyday life.
This book teaches the necessary mathematical techniques that schools neglect to horizontal addition, left-to-right multiplication, division, etc . You will learn a method of multiplication so rapidly that you'll be able to do products in not much more time than it would take to write the problem down on paper.
This is not a collection of tricks that work in only a very few special cases, but a serious, capably planned course in basic mathematics for self-instruction. It contains over 9,000 short problems and their solutions for you to work on during your spare moments. Five or ten minutes spent daily on this book will, within ten weeks, give you a number sense that will double or triple your calculation speed.
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