x
UNIT
13
Dividing Fractions
. . . . . . . . . . . . . . . . . . . .
101
Dividing Proper Fractions . . . . . . . . . . . . . . 101
Dividing Mixed Numbers . . . . . . . . . . . . . . 101
SECTION
3
Decimal Fractions
UNIT
14
Decimal System
. . . . . . . . . . . . . . . . . . . . . .
110
The Decimal Point . . . . . . . . . . . . . . . . . . . . . 110
Zeros in Decimal Numbers . . . . . . . . . . . . . 111
Decimals in Use . . . . . . . . . . . . . . . . . . . . . . . 111
UNIT
15
Converting between Common
Fractions and Decimal Fractions
. . .
115
Converting Decimal Fractions
to Common Fractions . . . . . . . . . . . . . . . 115
Converting Common Fractions
to Decimal Fractions . . . . . . . . . . . . . . . . 115
Rounding Decimals . . . . . . . . . . . . . . . . . . . . 115
Nearer Fractional Equivalent . . . . . . . . . . . . 117
UNIT
16
Adding Decimal Fractions
. . . . . . . . . . . .
123
Learning the Principles. . . . . . . . . . . . . . . . . 123
UNIT
17
Subtracting Decimal Fractions
. . . . . . .
131
Learning the Principles. . . . . . . . . . . . . . . . . 131
UNIT
18
Multiplying Decimal Fractions
. . . . . . .
139
Learning the Principles. . . . . . . . . . . . . . . . . 139
Multiplying by 10, 100, 1,000, etc.. . . . . . . . . 140
UNIT
19
Dividing Decimal Fractions.
. . . . . . . . . .
147
The Language of Division . . . . . . . . . . . . . . 147
Learning the Principles. . . . . . . . . . . . . . . . . 147
Division by 10, 100, 1,000, etc. . . . . . . . . . . . . 149
SECTION
4
Percent, Ratio,
and Proportion
UNIT
20
Percent and Percentage
. . . . . . . . . . . . . .
158
Percent or Percentage . . . . . . . . . . . . . . . . . . 158
Changing Percent to a Decimal . . . . . . . . . . 158
Changing Percent to a Fraction . . . . . . . . . . 159
Solving Percentage Problems . . . . . . . . . . . . 159
UNIT
21
Ratio and Proportions.
. . . . . . . . . . . . . . .
167
Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
Proportion . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
SECTION
5
Linear Measure
UNIT
22
Reading Rulers
. . . . . . . . . . . . . . . . . . . . . . .
178
The US Customary System . . . . . . . . . . . . . . 178
Reading a US Customary Ruler . . . . . . . . . . 178
Reading a Decimal Ruler . . . . . . . . . . . . . . . 179
The Metric System . . . . . . . . . . . . . . . . . . . . . 179
Reading a Metric Ruler . . . . . . . . . . . . . . . . . 180
UNIT
23
Perimeter and Circumference
. . . . . . . .
183
Perimeters of Four-Sided Shapes . . . . . . . . . 183
Circumference . . . . . . . . . . . . . . . . . . . . . . . . 185
Compound Shapes . . . . . . . . . . . . . . . . . . . . 186
UNIT
24
Tolerances
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
195
Precision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196