Pre-Algebra

Chapter 1

Name Period

Pre-Algebra

Chapter 1

Section 1-1

Variables and Expressions

Algebraic Expressions and Integers

Variables and Expressions

Identifying

Writing

Vocabulary Definition Example

Numeric Expression

An expression with only numbers

4 + 65 × 8 - 2

Variable A letter that represents an unknown number

A, f, or p

Variable Expression

An expression with at least one variable

4 + x, ab or 5n – 2

Operation Words

Add: total, more than, more, increased by, sum, and, combined, together

Subtract: difference, fewer than, less than, less, decreased by, left, minus

Multiply: product, times, per for each, multiply

Divide: quotient, divided by, per, for each, divide

Steps for Writing a Variable Expression

1. Identify the unknown or the variable.2. Determine the operation.3. Rewrite the expression using

mathematical symbols.

d dozen eggs dozen = 12 1 dozen = 1 × 12, 2 dozen = 2 × 12 d × 12 or 12d