Expressions

Front

The product of a number and twelve

Back

12x

Front

A number decreased by ten

Back

x - 10

Front

Twelve less than a number is thirty.

Back

x - 12 = 30

Front

Three times a number is twenty-one.

Back

3x = 21

Front

Twice a number, decreased by nineteen

Back

2x - 19

Front

Definition of an expression

Back

A mathematical phrase that can contain numbers, variables, and operators.

Front

What is a variable?

Back

A symbol used to represent a number that is not yet known.

Front

What does it mean to evaluate an expression?

Back

To calculate the value of an expression by substituting numbers for variables.

Front

What is the difference between an equation and an expression?

Back

An equation states that two expressions are equal, while an expression does not include an equality sign.

Front

How do you represent 'a number increased by five'?

Back

x + 5