| Lesson | Description |
| 1-30-1 | Subtraction Facts: Differences 0-5 |
| 1-30-2 | Subtraction Facts: Differences 0-10 |
| 1-30-3 | Subtraction Facts: Differences 0-14 |
| 1-30-4 | Subtraction Facts: Differences 0-18 |
| 1-30-5 | A 100 Problem Subtraction Facts Assessment |
| 1-30-6 | A 100 Problem Subtraction Facts Assessment |
| 1-30-7 | A 100 Problem Subtraction Facts Assessment |
| 1-30-8 | A 100 Problem Subtraction Facts Assessment |
| 1-30-9 | A 100 Problem Subtraction Facts Assessment |
| 1-31 | Subtraction 1 to 10 |
| 1-31-1 | Subtraction Facts 1 to 10, Random Order |
| 1-32 | More Subtraction Practice |
| 1-33 | Subtraction Facts 11 to 15 |
| 1-33-1 | Subtraction Facts 11-15, Random Order |
| 1-36 | Subtraction Facts 16 to 20 |
| 1-43 | Subtraction and the Difference |
| 1-52 | Two-Digit Subtraction |
| 2-13 | Subtraction Facts |
| 2-38 | Two-Digit Subtraction Practice |
| 2-41 | Understanding Regrouping with Two-Digit Subtraction |
| 2-42 | Subtracting Two-Digit Numbers Using Regrouping |
| 2-43 | Checking Two-Digit Subtraction Using Addition |
| 2-81 | Subtracting Three-Digit Numbers |
| 2-82 | Subtracting Three-Digit Numbers using Regrouping |
| 3-42 | Mental Math Methods, Subtraction |
| 3-46 | Subtracting Four-Digit Numbers |
| 3-47 | Regrouping with a Zero |
| 3-48 | Regrouping More Than Once |
| 3-50-1 | Three-Digit Subtraction with Regrouping |
| 3-50-2 | Four-Digit Subtraction with Regrouping of the Digit Zero |
| 3-51 | Four-Digit Subtraction |