# Pre Algebra Assignment Simplify Each Expression

A variable is a letter, for example x, y or z, that represents an unspecified number.

$$6+x=12$$

To evaluate an algebraic expression, you have to substitute a number for each variable and perform the arithmetic operations. In the example above, the variable x is equal to 6 since 6 + 6 = 12.

If we know the value of our variables, we can replace the variables with their values and then evaluate the expression.

**Example**

Calculate the following expression for x=3 and z=2

$$6z+4x=\: ?$$

Solution: Replace x with 3 and z with 2 to evaluate the expression.

$$6z+4x=\: ?$$

$$6\cdot {\color{blue} 2}+ 4\cdot {\color{blue} 3}=?$$

$$\: \, 12+12=24$$

**Video lesson**

Evaluate the following expression for x = 2, y = 5 and z = 4

$$4x+(7-z)-6y$$

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## Pre-Algebra Worksheets

## Algebraic Expressions Worksheets

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## Detailed Description for All Algebraic Expressions Worksheets

**Words to Algebraic Expressions**

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**Translate Phrases Worksheets**

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**Simplifying Variables Expressions Worksheets**

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**The Distributive Property Worksheets**

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**Evaluating One Variable Expressions Worksheets**

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**Evaluating Two Variables Expressions Worksheets**

These Algebraic Expressions Worksheets will create algebraic statements with two variables for the student to evaluate. You may select from 2, 3 and 4 terms with addition, subtraction, multiplication, and division. These Algebraic Expressions Worksheets are a good resource for students in the 5th Grade through the 8th Grade.