**Chapter 1: Numbers 0 to 5**

- Lesson 1: Count 1, 2, and 3
- Lesson 2: Read and Write 1, 2, and 3
- Lesson 3: Count 4 and 5
- Lesson 4: Read and Write 4 and 5
- Lesson 5: Read and Write 0
- Lesson 6: Equal To
- Lesson 7: Greater Than
- Lesson 8: Less Than
- Lesson 9: Compare Numbers 0 to 5
- Lesson 10: One More
- Lesson 11: Problem-Solving Strategy: Draw a Diagram

**Chapter 2: Numbers to 10**

- Lesson 1: Numbers 6 and 7
- Lesson 2: Number 8
- Lesson 3: Read and Write 6, 7, and 8
- Lesson 4: Number 9
- Lesson 5: Number 10
- Lesson 6: Read and Write 9 and 10
- Lesson 7: Problem-Solving Strategy: Act It Out
- Lesson 8: Compare Numbers 0 to 10
- Lesson 9: One More With Numbers to 10
- Lesson 10: Ordinal Numbers to Fifth
- Lesson 11: Ordinal Numbers to Tenth

**Chapter 3: Numbers Beyond 10**

- Lesson 1: Numbers 11 and 12
- Lesson 2: Numbers 13 and 14
- Lesson 3: Number 15
- Lesson 4: Numbers 16 and 17
- Lesson 5: Numbers 18 and 19
- Lesson 6: Number 20
- Lesson 7: Problem-Solving Strategy: Draw a Diagram
- Lesson 8: Count to 50 by Ones
- Lesson 9: Count to 100 by Ones
- Lesson 10: Count to 100 by Tens

**Chapter 4: Compose and Decompose Numbers to 10**

- Lesson 1: Make 4 and 5
- Lesson 2: Take Apart 4 and 5
- Lesson 3: Make 6 and 7
- Lesson 4: Take Apart 6 and 7
- Lesson 5: Problem-Solving Strategy: Act It Out
- Lesson 6: Make 8 and 9
- Lesson 7: Take Apart 8 and 9
- Lesson 8: Make 10
- Lesson 9: Take Apart 10

**Chapter 5: Addition**

- Lesson 1: Addition Stories
- Lesson 2: Use Objects to Add
- Lesson 3: Use the + Symbol
- Lesson 4: Use the = Symbol
- Lesson 5: How Many In All?
- Lesson 6: Problem-Solving Strategy: Write a Number Sentence
- Lesson 7: Add to Make 10

**Chapter 6: Subtraction**

- Lesson 1: Subtraction Stories
- Lesson 2: Use Objects to Subtract
- Lesson 3: Use the – Symbol
- Lesson 4: Use the = Symbol
- Lesson 5: How Many Are Left?
- Lesson 6: Problem-Solving Strategy: Write a Number Sentence
- Lesson 7: Subtract to Take Apart 10

**Chapter 7: Compose and Decompose Numbers 11 to 19**

- Lesson 1: Make Numbers 11 to 15
- Lesson 2: Take Apart Numbers 11 to 15
- Lesson 3: Problem-Solving Strategy: Make a Table
- Lesson 4: Make Numbers 16 to 19
- Lesson 5: Take Apart Numbers 16 to 19

**Chapter 8: Measurement**

- Lesson 1: Compare Length
- Lesson 2: Compare Height
- Lesson 3: Problem-Solving Strategy: Guess, Check, and Revise
- Lesson 4: Compare Weight
- Lesson 5: Describe Length, Height, and Weight
- Lesson 6: Compare Capacity

**Chapter 9: Classify Objects**

- Lesson 1: Alike and Different
- Lesson 2: Problem-Solving Strategy: Use Logical Reasoning
- Lesson 3: Sort by Size
- Lesson 4: Sort by Shape
- Lesson 5: Sort by Count

**Chapter 10: Position**

- Lesson 1: Above and Below
- Lesson 2: In Front of and Behind
- Lesson 3: Next to and Beside
- Lesson 4: Problem-Solving Strategy: Act It Out

**Chapter 11: Two-Dimensional Shapes**

- Lesson 1: Squares and Rectangles
- Lesson 2: Circles and Triangles
- Lesson 3: Squares, Rectangles, Triangles, and Circles
- Lesson 4: Hexagons
- Lesson 5: Shapes and Patterns
- Lesson 6: Shapes and Positions
- Lesson 7: Compose New Shapes
- Lesson 8: Problem-Solving Strategy: Use Logical Reasoning
- Lesson 9: Model Shapes in the World

**Chapter 12: Three-Dimensional Shapes**

- Lesson 1: Spheres and Cubes
- Lesson 2: Cylinders and Cones
- Lesson 3: Compare Solid Shapes
- Lesson 4: Problem-Solving Strategy: Act It Out
- Lesson 5: Model Shapes in the World