Quick(er) Calculations: How to add, subtract, multiply, divide, square, and square root more swiftly

by Trevor Davis Lipscombe

Overview

Finalist of the 2022 PROSE Awards

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.

What's more, this book gives suggestions for how to find answers that are "good enough" for tricky tasks like dividing by 17. It includes brand new ways to multiply and divide irrational numbers such as pi, e, the square root of 2, and the golden ratio. It has sections devoted to ancient mathematics, and the techniques we can borrow from previous and other cultures, in order to calculate more quickly. Examples, some serious, some fun, come from everyday life or from history — like hot dog eating competitions, the Vatican's cricket team, the molecular weight of the molecule with the world's longest name, and the amount of people taken by Henry VIII to arguably history's biggest party, the Field of the Cloth of Gold. In an age of timed multiple-choice questions, the swifter you can sum, or rule out wrong answers, the better you will do. If you love to play with numbers, this book will be recreational reading. And if you ever wonder whether simple arithmetic problems can crop up in everyday life, this book provides a fresh perspective.

Product Details

ISBN-13:	9780198852650
Publisher:	Oxford University Press
Publication date:	07/06/2021
Edition description:	1
Pages:	192
Product dimensions:	8.50(w) x 5.60(h) x 0.70(d)

About the Author

Trevor Davis Lipscombe, Director, Catholic University of America Press

Trevor Lipscombe graduated with an undergraduate degree in theoretical physics from Queen Mary College, University of London, and then obtained a doctorate in theoretical physics from the University of Oxford. He is the author, with Alice Calaprice, of “Albert Einstein: A Biography,” and sole author of “The Physics of Rugby,” which was selected as one of the best ten physics books of 2009. He edited the critical edition of Saint John Henry Newman's novel “Loss and Gain.” Trevor was a postdoctoral researcher at the Levich Institute at the City College of New York, but has also worked in a homeless shelter, a physics journal, and three university presses. He remains fond of finding ways to present science-related materials simply.

Table of Contents

PrefaceIntroductionChallenge1. Arithmetical Advice2. Speedier Sums and SubtractionsInterlude I: The Magic of 111,1113. Accounting for Taste — Adding Columns QuicklyInterlude II: Checking, Check Digits, and Casting out Nines4. Quicker Quotients and Pleasing Products — Multiply and Divide by Specific NumbersInterlude III: Doomsday5. Calculations with Constraints — Multiply and Divide by Numbers with Specific PropertiesInterlude IV: Multicultural Multiplication6. Super Powers — Calculate Squares, Square Roots, Cube Roots, and More7. Close-Enough Calculations — Quick and Accurate ApproximationsInterlude V: Approximating the Number of Space Aliens8. Multiplying IrrationallyThe Grand FinaleFurther ReadingAppendix I: Calculating DoomsdayAppendix II: The Squares from 1 to 100