# 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.

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