# 1.11: Mental Math for Addition and Subtraction Equations

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**Practice**Mental Math for Addition and Subtraction Equations

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Algebraic Expression

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

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

A variable equation is a mathematical sentence that contains at least one variable or unknown quantity and an equals sign.### Image Attributions

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Description

Solve single variable addition and subtraction equations by using mental math

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Date Created:

Nov 30, 2012
Last Modified:

Feb 19, 2016
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