## Unit 2: Addition and Subtraction

Page
Location: Adding and Subracting Whole Numbers
Lesson 1 - Hands On: Estimate and Check 52

Lesson 3 - Estimate Sums 58 Addition Estimation with Whole Numbers Estimation When Adding Whole Numbers

Lesson 5 - Problem Solving: Sawdust Art Festival 64 Practice Addition with Whole Numbers w/Estimation  Addition of Whole Numbers with Estimation Practice
Review/Test  68

Chapter 4 - Subtraction
Location: Adding and Subracting Whole Numbers
Lesson 1 - Hands On: Model Subraction from 2,000 72

Lesson 2 - Estimate Differences 74 Estimating Differences of Whole Numbers
Estimating Differences of Whole Numbers
Lesson 3 - Subtract Whole Numbers 78 Subtraction with Whole Numbers Subtraction of Whole Numbers
Lesson 4 - Subtract Across Zeroes 82 Subtraction with Whole Numbers Across Zeroes Whole Number Subtraction Across Zeroes
Lesson 5 - PS: Too Much or Too Little Information 84 Practice Subtraction with Whole Numbers w/Estimation Subtraction with Estimation Practice
Review/Test 88

Chapter 5 - Expressions and Equations
Located Under Algebra
Lesson 1 - Hands On; Expressions aand Parentheses 92

Lesson 2 - Write and Evaluate Expressions 94 Simplifying Expressions Involving Addition and Subtraction Expressions, Equations, and Inequalities with Addition and Subtraction
Lesson 3 - Expressions, Equations, and Inequalities 98 Equations, Expressions, and Inequalities Comparing Expressions Involving Addition and Subtraction
Lesson 4 - Add Equals to Equals 102

Lesson 5 - PS: Break a Problem Into Parts 104

Review/Test 110