Unit 2: Addition and Subtraction

• Chapter 4: Add Whole Numbers
  • Lesson 4.1 Addition Properties
  • Lesson 4.2 Estimate Sums
  • Lesson 4.3 Regroup Ones
  • Lesson 4.4 Regroup Ones and Tens
  • Lesson 4.5 Problem-Solving Strategy: Guess and Check
  • Lesson 4.6 Column Addition
  • Lesson 4.7 Add Greater Numbers
  • Lesson 4.8 Choose a Method
  • Lesson 4.9 Problem-Solving Decision: Estimate or Exact Answer
• Chapter 5: Subtract Whole Numbers
  • Lesson 5.1 Subtraction Rules
  • Lesson 5.2 Relate Addition and Subtraction
  • Lesson 5.3 Estimate Differences
  • Lesson 5.4 Regroup Tens
  • Lesson 5.5 Regroup Tens and Hundreds
  • Lesson 5.6 Subtract Greater Numbers
  • Lesson 5.7 Subtract Across Zeros
  • Lesson 5.8 Problem-Solving Decision: Explain Your Answer