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 others who work with figures. This is "number sense" -- or 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...