## Lesson: Using Inverse Operations to Solve Equations

Introducing the Concept

Although students have been introduced to the concept of using inverse operations to solve equations, they may not have understood that they are actually performing the same operation on both sides of the equation. By modeling this concept, students will move from solving equations through the use of related facts to solving by using inverse operations.

**Materials:** pan balance, 50 connecting cubes

**Prerequisite Skills and Concepts:** Students should know how to write and evaluate algebraic expressions and how to write and solve addition and subtraction equations using inverse operations. They should also know basic multiplication and division facts.

Begin by reviewing the difference between an expression and an equation.

6m x
2 |
= | 18 x 2 |

12m |
= | 36 Think: 36 ÷ 12 = 3 |

m |
= | 3 |