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| Unit 1: Building Numbers and Solving Story Problems |
| Investigation 1 – Counting and Quantity |
| Investigation 2 – Introducing Addition |
| Investigation 3 – Introducing Subtraction |
| Unit 2: Comparing and Combining Shapes |
| Investigation 1 – Composing and Decomposing 2-D Shapes |
| Investigation 2 – Describing and Sorting Shapes |
| Unit 3: How Many of Each? How Many in All? |
| Investigation 1 – Counting On and Back |
| Investigation 2 – How Many of Each? |
| Investigation 3 – Multiple Addends and Equivalent Expressions |
| Investigation 4 – Working with Larger Numbers |
| Unit 4: Fish Lengths and Fraction Rugs |
| Investigation 1 – Measuring and Comparing |
| Investigation 2 – Halves and Fourths |
| Unit 5: Number Games and Crayon Problems |
| Investigation 1 – Combinations of 10 |
| Investigation 2 – Addition and Subtraction |
| Investigation 3 – Problems about Unknown Change |
| Unit 6: What Would You Rather Be an Eagle or a Whale? |
| Investigation 1 – Collecting, Representing, and Solving Problems About Data in Two Categories |
| Investigation 2 – Organizing and Analyzing Data in 3 Categories |
| Unit 7: How Many Tens? How Many Ones? |
| Investigation 1 – Counting, Adding, and Subtracting Groups of 10 |
| Investigation 2 – Tens and Ones |
| Investigation 3 – Adding Within 100 |
| Unit 8: Blocks and Buildings |
| Investigation 1 – Blocks and Buildings |