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

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

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  • 製本 Hardcover:ハードカバー版／ページ数 192 p.
  • 言語 ENG
  • 商品コード 9780198852650
  • DDC分類 513.9

Full Description

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.

Contents

Preface
Introduction
Challenge
1: Arithmetical Advice
2: Speedier Sums and Subtractions
Interlude I: The Magic of 111,111
3: Accounting for Taste -- Adding Columns Quickly
Interlude II: Checking, Check Digits, and Casting out Nines
4: Quicker Quotients and Pleasing Products -- Multiply and Divide by Specific Numbers
Interlude III: Doomsday
5: Calculations with Constraints -- Multiply and Divide by Numbers with Specific Properties
Interlude IV: Multicultural Multiplication
6: Super Powers -- Calculate Squares, Square Roots, Cube Roots, and More
7: Close-Enough Calculations -- Quick and Accurate Approximations
Interlude V: Approximating the Number of Space Aliens
8: Multiplying Irrationally
The Grand Finale
Further Reading
Appendix I: Calculating Doomsday
Appendix II: The Squares from 1 to 100