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| Lesson 1-1: Sums Through 5 |
| Lesson 1-2: Sums Through 6 |
| Lesson 1-3: Sums of 7 and 8 |
| Lesson 1-4: Sums of 9 and 10 |
| Lesson 1-5: Related Addition Facts |
| Lesson 1-6: Count On to Add |
| Lesson 1-7: Problem Solving: Use the Four-Step Process |
| Lesson 2-1: Add Three Numbers |
| Lesson 2-2: Solve Addition Word Problems |
| Lesson 2-3: Doubles and Doubles Plus 1 |
| Lesson 2-4: Equivalent Sums |
| Lesson 2-5: Addition Practice |
| Lesson 2-6: Problem Solving: Use a Number Sentence |
| Lesson 2-7: Solve for Unknown Addends |
| Lesson 3-1: Subtract from 5 or Less |
| Lesson 3-2: Subtract from 6 or Less |
| Lesson 3-3: Subtract from 7 and 8 |
| Lesson 3-4: Subtract from 9 and 10 |
| Lesson 3-5: Problem Solving: Use a Model |
| Lesson 3-6: Count on to Subtract |
| Lesson 3-7: All or Zero |
| Lesson 4-1: Related Subtraction Facts |
| Lesson 4-2: Relate Addition and Subtraction |
| Lesson 4-3: Fact Families Through 10 |
| Lesson 4-4: Think Addition to Subtract |
| Lesson 4-5: Check by Adding |
| Lesson 4-6: Problem Solving: Use a Model |
| Lesson 4-7: Find Missing Addends |
| Lesson 4-8: Subtract to Compare |
| Lesson 4-9: Solve Comparison Word Problems |
| Lesson 5-1: Order by Length |
| Lesson 5-2: Use Indirect Comparison |
| Lesson 5-3: Same-Size Length Units |
| Lesson 5-4: Measure Length |
| Lesson 5-5: Problem Solving: Use Logical Reasoning |
| Lesson 5-6: Make and Use a Ruler |
| Lesson 5-7: Inches |
| Lesson 6-1: Tens and Ones |
| Lesson 6-2: Tens Through One Hundred |
| Lesson 6-3: Numbers 11 Through 19 |
| Lesson 6-4: Numbers 20 Through 39 |
| Lesson 6-5: Numbers 40 Through 59 |
| Lesson 6-6: Numbers 60 Through 89 |
| Lesson 6-7: Numbers 90 Through 100 |
| Lesson 6-8: Problem Solving: Use a Model |
| Lesson 6-9: Count and Order Using Hundred Chart Patterns |
| Lesson 7-1: Place Value of Digits |
| Lesson 7-2: Expanded Form |
| Lesson 7-3: Decompose Two-Digit Numbers |
| Lesson 7-4: Numbers to 120 |
| Lesson 7-5: Number Patterns to 120 |
| Lesson 7-6: Compare Numbers |
| Lesson 7-7: Order Numbers |
| Lesson 7-8: Problem Solving: Use Reasoning |
| Lesson 8-1: Make 10 to Add |
| Lesson 8-2: Addition: Sums of 11 and 12 |
| Lesson 8-3: Addition: Sums through 14 |
| Lesson 8-4: Addition: Sums Through 16 |
| Lesson 8-5: Addition: Sums Through 18 |
| Lesson 8-6: Addition: Sums Through 20 |
| Lesson 8-7: Three Addends |
| Lesson 8-8: Problem Solving: Write and Solve an Equation |
| Lesson 9-1: Make 10 to Subtract |
| Lesson 9-2: Subtract from 11 and 12 |
| Lesson 9-3: Subtract from 13 and 14 |
| Lesson 9-4: Subtract from 16 or Less |
| Lesson 9-5: Subtract from 20 or Less |
| Lesson 9-6: Fact Families Through 20 |
| Lesson 9-7: Problem Solving: Use a Number Sentence |
| Lesson 9-8: True and False Equations |
| Lesson 9-9: Missing Part of an Equation |
| Lesson 10-1: Read Tally Charts |
| Lesson 10-2: Make Tally Charts |
| Lesson 10-3: Read Picture Graphs |
| Lesson 10-4: Make Picture Graphs |
| Lesson 10-5: Problem Solving: Use a Model |
| Lesson 11-1: Mental Math: Find 10 More |
| Lesson 11-2: Add Tens |
| Lesson 11-3: Add Two-Digit Numbers and Multiples of Ten |
| Lesson 11-4: Add Two-Digit and One-Digit Numbers |
| Lesson 11-5: Make a 10 to Add Two-Digit and One-Digit Numbers |
| Lesson 11-6: Add Two-Digit Numbers |
| Lesson 11-7: Make a 10 to Add Two-Digit Numbers |
| Lesson 11-8: Break Apart to Add |
| Lesson 11-9: Problem Solving: Use a Model |
| Lesson 12-1: Mental Math: Find 10 Less |
| Lesson 12-2: Subtract Tens |
| Lesson 12-3: Think Addition to Subtract Tens |
| Lesson 12-4: Subtract Tens from Two-Digit Numbers |
| Lesson 12-5: Problem Solving: Guess and Test |
| Lesson 13-1: Two-Dimensional Shapes |
| Lesson 13-10: Problem Solving: Use Logical Reasoning |
| Lesson 13-2: Attributes of Two-Dimensional Shapes |
| Lesson 13-3: Compose Two-Dimensional Shapes |
| Lesson 13-4: Compose More Two-Dimensional Shapes |
| Lesson 13-5: Three-Dimensional Shapes |
| Lesson 13-6: Attributes of Three-Dimensional Shapes |
| Lesson 13-7: Compare Two-Dimensional and Three-Dimensional Shapes |
| Lesson 13-8: Sort Two-Dimensional and Three-Dimensional Shapes |
| Lesson 13-9: Compose Three-Dimensional Shapes |
| Lesson 14-1: Equal Shares |
| Lesson 14-2: Make Halves |
| Lesson 14-3: Make Fourths |
| Lesson 14-4: Halves and Fourths |
| Lesson 14-5: Problem Solving: Draw a Picture |
| Lesson 15-1: Hour |
| Lesson 15-2: Half Hour |
| Lesson 15-3: Time Patterns |
| Lesson 15-4: Day and Night |
| Lesson 15-5: Problem Solving: Use Logical Reasoning |
| Lesson 16-1: Pennies and Nickels |
| Lesson 16-2: Dimes and Quarters |
| Lesson 16-3: Count On by Dimes and Pennies |
| Lesson 16-4: Count On by Dimes and Nickels |
| Lesson 16-5: One Dollar |
| Lesson 16-6: Problem Solving: Work Backward |