**Lesson** | **Description** |

1-22 | Introduction to the Symbols + and - |

1-22-1 | Addition Facts: Sums 0-5 |

1-22-2 | Addition Facts: Sums 0-10 |

1-22-3 | Addition Facts: Sums 0-14 |

1-22-4 | Addition Facts: Sums 0-18 |

1-23 | Addition Facts 1 to 10 |

1-23-1 | Addition Facts 1 to 10, Random Order |

1-26 | Counting Objects and Counting Forward |

1-26-1 | A 100 Problem Addition Facts Assessment |

1-26-2 | A 100 Problem Addition Facts Assessment |

1-26-3 | A 100 Problem Addition Facts Assessment |

1-26-4 | A 100 Problem Addition Facts Assessment |

1-26-5 | A 100 Problem Addition Facts Assessment |

1-27 | Addition Facts 11 to 15 |

1-27-1 | Addition Facts 11 to 15, Random Order |

1-28 | Addition Facts 16 to 20 |

1-28-1 | Addition Facts 16 to 20, Random Order |

1-37 | Addition Facts with the Same Sum |

1-38 | Zero and the Sum |

1-41 | Adding Two Numbers Up and Down |

1-42 | Adding Three Numbers Up and Down |

1-46 | The Difference and the Sum Using the Symbols >, <, and = |

1-47 | The Fact Families 1 to 10 |

1-51 | Two-Digit Addition |

2-7 | Introduction to Addition Vocabulary, Addends, Sum, and Equations |

2-8 | Using a Number Line to Add and Subtract |

2-11 | Finding the Sum of Two Addends |

2-12 | Using an Addition Table. Facts, 1 Through 9 |

2-16 | Adding Three One-Digit Numbers Vertically |

2-17 | Finding the Sums of Two-Digit Numbers |

2-22 | Checking Addition Using Subtraction |

2-23 | Fact Families 1 - 20 |

2-27 | Practice Addition Facts with Missing Addends |

2-28 | Two-Digit Addition, Regrouping Ones and Tens |

2-31 | Two-Digit Addition, Regrouping Ones and Tens |

2-32 | Two-Digit Addition |

2-33 | Two-Digit Addition with Regrouping |

2-36 | Checking Addition by Reversing the Addends |

2-37 | Adding Three Two-Digit Numbers |

2-46 | Adding and Subtracting Horizontally |

2-47 | Adding and Subtracting Vertically |

2-48 | Changing Horizontal Addition to Vertical Addition |

2-51 | Building Upon Facts You Already Know. Familiar Patterns. |

2-52 | Adding and Subtracting Horizontally |

2-76 | Adding Three-Digit Numbers |

2-77 | Regrouping Tens |

2-78 | Adding Three-Digit Numbers with Regrouping |

3-33 | Vertical Addition |

3-36 | Mental Math Methods, Addition |

3-43 | Adding Four-Digit Numbers |

3-52 | Adding and Subtracting Money |

3-53 | Mental Math Methods, Thousands |

4-11 | Addition: Hundred Thousands Place Value |

4-11-1 | Addition: Hundred Thousands Place Value |

4-12 | Mental Addition and Subtraction |

5-1 | Properties of Addition |

5-2 | Variables |

5-3 | Opposite Operations, Equations |