3-1 Estimate Sums or Differences
3-2 Strategies to Add Multi-Digit Numbers
3-3 Understand an Addition Algorithm
3-4 Understand and Addition Algorithm Involving Regrouping
3-5 Number: Rounding Whole Numbers
3-6 Problem Solving: Make an Organized List
3-7 Understand a Subtraction Algorithm Involving Addition and Subtraction
3-8 Represent and Solve Multi-Step Problems
3-9 Solve Multi-Step Problems Involving Addition and Subtraction