## Lesson: Expressions and Equations

Developing the Concept

The next step for students in understanding expressions and equations is to complete addition and subtraction operations within parentheses first. Later in their studies, students will learn the complete order of operations (parentheses, exponents, multiplication and division, addition and subtraction), but for now they need to know to do what is within the parentheses first and then to add and subtract from left to right.

**Materials:** overhead projector or chalkboard

**Preparation:** none

**Prerequisite Skills and Concepts:** none

Write **(4 + 6) + (2 + 5)** on the board or overhead. Have a student read aloud the expression and help identify the parentheses.

**Wrap-Up and Assessment Hints**

Test student understanding of the equals sign by having them write about the difference between expressions and equations.