# Lesson Plan: Subtraction of Rational Numbers Mathematics • 7th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to subtract rational numbers, including fractions, decimals, and percentages

#### Objectives

Students will be able to

- use a number line to subtract rational numbers,
- subtract rational numbers as fractions (including mixed numbers) with like denominators,
- subtract rational numbers as fractions (including mixed numbers) with unlike denominators by using the LCM of the denominators,
- subtract rational numbers in different forms,
- convert between fractions, decimals, and percentages in order to subtract rational numbers of different forms.

#### Prerequisites

Students should already be familiar with

- the definition of a rational number,
- simplifying fractions,
- converting between fractions, decimals, and percentages,
- addition of rational numbers,
- addition and subtraction of negative numbers.

#### Exclusions

Students will not cover

- multiplication and division of rational numbers,
- percentages,
- evaluating algebraic expressions.