Math Lesson Plan · Grades 6–9

One Step Equations Addition Lesson

Introduce students to solving one-step equations using addition. The lesson builds from the concept of balance — what you do to one side you must do to the other — and teaches students to isolate the variable by subtracting from both sides. Includes 20 practice problems and answer key.

Lesson Overview

Solving One-Step Equations Using Addition

An equation is like a balance scale: both sides must be equal. To solve a one-step addition equation, undo the addition by subtracting the same value from both sides. For example, to solve x + 5 = 12, subtract 5 from both sides to get x = 7. The lesson introduces this concept starting from the idea of balance.

The six-page lesson walks through the inverse operation concept with worked examples, including equations with negative numbers. Students then complete 20 practice problems covering a range of integer values. The answer key covers all 20 problems.

How to Use This Lesson

1. Introduce the concept of balance in equations (pages 1–2). Demonstrate with a number line or balance scale visual.

2. Work through the addition equation examples (pages 3–4). Practice the inverse operation strategy together.

3. Assign the 20 practice problems (page 5) independently. Review answers using the key on page 6.

Printable Resource

A classroom-ready PDF with everything in one printable resource.

Keep Exploring Math