# Algebraic Expressions

Contributor: Danielle Childers. Lesson ID: 10775

Smile! Frown! Grimace! Faces express our feelings. Algebraic expressions show the value of numbers and symbols. Learn to translate word problems into algebraic expressions with video and online games!

categories

## Expressions and Equations, Pre-Algebra

subject
Math
learning style
Visual
personality style
Beaver
Middle School (6-8)
Lesson Type
Skill Sharpener

## Lesson Plan - Get It!

Audio:
• When someone asks you to give them a happy expression, what does your face look like?
• What if they asked for a surprised expression?
• What if someone asked you to give them an algebraic expression — what would you do?

Just like your face can show an expression of how you are feeling, a math expression shows the value of the numbers and symbols given.

In this lesson, you will review how to build, read, then solve an algebraic expression.

For a quick reminder and some hints on reading and building algebraic expressions, look at the notes below.

Following these simple steps will help you when you are writing equations:

1. You want to identify the unknown, which is the variable.

Example: A number increased by 3 is 8.

You are trying to find out what number is increased by 3.

1. Let "X" stand for the unknown number.

Rewrite the sentence. (You can use any letter to stand for the variable, but "X" is the most common.)

X increased by 3 is 8.

1. Now, look for keywords that help you finish writing the number sentence (equation).

X increased by 3 is 8.

Increased by tells us that it is an addition problem.

By tells us to use the equal sign.

1. Fully write out the equation:

x + 3 = 8