Everyday Math Tricks for Grown-Ups: Shortcuts and Simple Solutions for the Not-So-Math Minded

Overview

For all you adults out there who still secretly count on your fingers (and toes) or are hopeless without (or maybe even with) a calculator, this is the book for you. Does the thought of doing even the simplest of calculations put your stomach in a knot? Do you know how to quickly figure out the discount on that 15 percent off rack? Are you able to calculate your gas mileage or the cost per pound of a bunch of grapes? Imagine how much easier your life would be if you had a few easy-to-remember ways to deal with ...

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Overview

For all you adults out there who still secretly count on your fingers (and toes) or are hopeless without (or maybe even with) a calculator, this is the book for you. Does the thought of doing even the simplest of calculations put your stomach in a knot? Do you know how to quickly figure out the discount on that 15 percent off rack? Are you able to calculate your gas mileage or the cost per pound of a bunch of grapes? Imagine how much easier your life would be if you had a few easy-to-remember ways to deal with all of the math challenges you face each and every day. Everyday Math Tricks for Grown-Ups will show you how.

Don't worry, this isn't the mind-numbingly boring math textbook you vaguely remember from your dreary schooldays. Lively text and simple examples illustrate all the basics-addition, subtraction, multiplication, and division-and even gets into some more advanced topics such as ratios, decimals, powers, and roots. You'll find yourself dipping in and out often whenever you need to brush up. This book promises to provide many eureka moments as a light bulb goes off when you finally grasp concepts that may have mystified you up until now. And along the way, reading about even the most boring of concepts will provide you with a few good laughs. As you will soon discover, this book will make everyday math problems as easy as pi!

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Product Details

  • ISBN-13: 9781606523292
  • Publisher: Reader's Digest Association, Incorporated, The
  • Publication date: 8/4/2011
  • Pages: 176
  • Product dimensions: 4.82 (w) x 7.78 (h) x 0.56 (d)

Meet the Author

Kjartan Poskitt is the author of the successful "Murderous Maths" series of books, which have been translated into more than 20 languages, and has presented numerous BBC educational programs on the subject.
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Table of Contents

Preface 10

Adding

Using the Place System 13

How to Check a Receipt Quickly 16

Subtracting

The Old Way 18

The New Way 20

Negative Numbers 21

Multiplying

The Hidden Secrets of the Times Tables 24

Prime Numbers 27

Finger Tables 28

Big Multiplication 29

The Foolproof Way to Multiply 31

Multiplying Hundreds and Thousands 33

Multiplying Negative Numbers 33

And if You Only Know the Two Times Table 36

Dividing

Sharing Out 37

Dividing Bigger Numbers 38

How to Test If Numbers Divide Exactly by 41

Long Division 42

The Order of Play

Dealing with a Line of Math Problems 47

Making a Rough Guess

Rounding Off 51

Fractions

Reducing Fractions 52

Comparing, Adding, and Subtracting Fractions 54

Mixed Fractions and Improper Fractions 56

Multiplying by Fractions and the Meaning of "Of" 57

Dividing by Fractions 59

Ratios

How Big Is Your TV? 62

The Shadow Stick 63

Mixture Ratios 64

Decimals

What Happens beyond the Decimal Point? 66

Converting between Fractions and Decimals 68

How Decimals Can Help with Fractions 69

Multiplying and Dividing by 10,100 or 1,000 70

Problems with Decimals 71

Powers and Roots

Squares and Square Roots 74

Other Powers and Roots 75

Standard Form 76

Averages

The Mean 78

The Mode and the Median 80

Algebra

What's the Point? 81

Positive, Negative, and Equal Signs 82

Brackets 85

Bring on the Letters 85

Dos and Don'ts 87

Math Mysteries Explained with Algebra 90

Simultaneous Equations 95

Think of a Number 95

Time to Leave Algebra 98

Speed

Working Out Speed 101

Getting the Units Right 102

Combining Different Speeds 103

Percentages

From Fractions and Decimals 104

Money and Percentages 106

The Three Most Common Percentage Problems 108

Percentage Mistakes 110

Interest

Simple Interest 113

Compound Interest (Or How to Make More Money) 114

Loan Interest (Or How to Lose It!) 117

Measuring Systems and Conversions

Meters, Liters, and Grams 121

Kilo, Mega, and Milli 123

Conversions 124

Line, Area, and Volume

Line 130

Area 132

Volume of a Cuboid 137

Circles and π 137

Cylinders 140

Spheres 141

Pythagoras and His Theorem 143

How Does Chance Work?

Dice Chances 147

Birthday Chances 147

Card Chances and Poker Hands 149

Some Random Chances 152

Two Misleading Chances 154

The Bookie's Profit 156

Extra Maths

Angles, Triangles, and Trig 160

What's a Logarithm? 162

Glossary 167

QED 175

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