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97304
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Math you can really use every day
Wattcode: 97304

39



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Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii
1 Close Enough . . . . . . . . . . . . . . . . . . . . . . . . . . .1
It's the Big Ones That Count . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Rounding Up or Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
2 A Number of Realms of Numbers . . . . . . . . . . . .5
The Realm McCoys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Once, Twice, Three Shoot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
When I Was in My Prime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3 Arithmetic of Whole Numbers . . . . . . . . . . . . . .11
Addition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Multiplication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Hey, Hey, Take It Away . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Standard Column Subtraction . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Renaming in Subtraction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
A House Divided . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
4 Common Fractions . . . . . . . . . . . . . . . . . . . . . .37
What Is a Fraction? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Equivalent Fractions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Adding and Subtracting Fractions . . . . . . . . . . . . . . . . . . . . . . . .41
Multiplying Fractions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Reciprocals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Dividing Fractions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Fractions Greater than One . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Adding Mixed Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Subtracting Mixed Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Changing Mixed Numbers to Fractions . . . . . . . . . . . . . . . . . . . .53
Multiplying and Dividing Mixed Numbers . . . . . . . . . . . . . . . . . .54
5 Decimal Fractions . . . . . . . . . . . . . . . . . . . . . . .56
Place Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Extending Place Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
v
Table of Contents

Adding and Subtracting Decimals . . . . . . . . . . . . . . . . . . . . . . . .59
Multiplying Decimals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6...

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