Quick(er) Calculations. How to add, subtract, multiply, square, and square root more swiftly, Hardback/Trevor Davis Lipscombe

How fast can you calculate? Would you like to be faster? This book presents the time honored tricks and tips of calculation, from a fresh perspective, to boost the speed at which you can add - whether a couple of numbers, or columns so long an accountant may faint. Find out how to subtract, multiply, divide, and find square roots more quickly. Illustrations: 4 grayscale line figures