# Digits, Grade 8, Volume 1, Homework Helper

## Contents

• Authors and Advisors vi

• Using the Homework Helper viii

• Grade 8 TEKS x

• Unit A: Number and Operations

• Topic 1: Rational and Irrational Numbers

• 1-1: Exploring Irrational Numbers 1

• 1-2: Approximating Irrational Numbers 8

• 1-3: Comparing and Ordering Rational and Irrational Numbers 15

• 1-4: Exploring Scientific Notation 21

• 1-5: Using Scientific Notation to Describe Very Large Quantities 27

• 1-6: Additional Problem Solving 33

• Unit B: Proportionality

• Topic 2: Proportional Relationships, Lines, and Linear Equations

• 2-1: Representing Proportional Relationships 40

• 2-2: Linear Equations: y = mx 47

• 2-3: The Slope of a Line 52

• 2-4: Unit Rates and Slope 60

• 2-5: The y-intercept of a Line 66

• 2-6: Linear Equations: y = mx + b 71

• 2-7: Distinguishing Between Proportional and Non-Proportional Situations 78

• 2-8: Additional Problem Solving 86

• Topic 3: Defining and Comparing Functions

• 3-1: Recognizing a Function 91

• 3-2: Representing a Function 99

• 3-3: Linear Functions 107

• 3-4: Nonlinear Functions 114

• 3-5: Additional Problem Solving 119

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