Unit 31: Algebraic Expressions and Variables

Day 12 of 30

Simplifying expressions: combining and distributing

6-8Mathematics

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Learning Objective

Students will explore simplifying expressions and combining and distributing through guided practice and application.

Today's Lesson

In this lesson, we'll explore simplifying expressions: combining and distributing. Mathematical thinking develops logical reasoning and problem-solving abilities.

An expression is a combination of numbers, variables, and operations (like +, −, ×, ÷). Unlike an equation, an expression doesn't have an equals sign. Examples: 3x + 5, 2(4 + 1), or 7 − 2. Expressions represent a value, and we can simplify them by following the order of operations. Think of expressions as mathematical phrases, while equations are complete sentences!

As you work through today's material, pay attention to the examples and try to identify the patterns or strategies being used. This will help you apply these concepts to new problems.

Take notes on key points and make connections to what you've already learned in previous lessons.

Key Terms
Problem

A mathematical question requiring analysis and solution

Solution

The result obtained by solving a problem

Activities
Instructions
1. Review the example problems for simplifying expressions: combining and distributing. 2. Identify the steps and strategies used. 3. Work through practice problems independently. 4. Compare solutions with a partner.
Materials Needed
  • Notebook
  • Calculator (if needed)
  • Graph paper
Practice Problems
1

Simplify: 6/9

Hint: Find the GCF of 6 and 9 (it's 3). Divide both by 3.
2

Simplify: 12/16

Hint: Divide numerator and denominator by 4.
3

Is 5/8 in simplest form?

Hint: Do 5 and 8 have any common factors besides 1?

Teaching Tip

For advanced learners: Encourage deeper analysis and real-world connections. Consider extension activities that allow students to apply simplifying expressions: combining and distributing to novel situations.

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