Unit 6: Expressions, equations, and inequalities

Lesson 4: Reasoning about equations and tape diagrams (part 1)
Lesson 6: Distinguishing between two types of situations
Lesson 7: Reasoning about solving equations (part 1)
Lesson 9: Dealing with negative numbers
Lesson 10: Different options for solving one equations
Lesson 11: Using equations to solve problems
Lesson 13: Reintroducing inequalities
Lesson 15: Efficiently solving inequalities
Lesson 17: Modeling with inequalities
Lesson 18: Subtraction with equivalent expressions
Lesson 19: Expanding and factoring
Lesson 20: Combining like terms (part 1)
Lesson 21: Combining like terms (part 2)
Lesson 22: Combining like terms (part 3)