# 7.1: Addition and Subtraction Phrases as Equations

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**At Grade**Created by: CK-12
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Algebraic Expression

Algebraic Expression

An expression that has numbers, operations and variables, but no equals sign.Equation

Equation

An equation is a mathematical sentence that describes two equal quantities. Equations contain equals signs.Expression

Expression

An expression is a mathematical phrase containing variables, operations and/or numbers. Expressions do not include comparative operators such as equal signs or inequality symbols.Variable

Variable

A variable is a symbol used to represent an unknown or changing quantity. The most common variables are a, b, x, y, m, and n.### Image Attributions

## Description

Explore how to translate addition and subtraction phrases into operations, variables, or expressions.

## Learning Objectives

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## Difficulty Level:

At Grade## Subjects:

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## Date Created:

Nov 30, 2012## Last Modified:

Sep 23, 2015## Vocabulary

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