Expressions and Equations

Writing Expressions

100

one less than a number

n - 1

200

a number squared

n²

300

the quotient of a number and four minus two

n/4 - 2

400

three more than four times a number

4n + 3

500

five less than the quotient of a number and seven

n/7 - 5

Evaluating Expressions

100

6n + 5

n= -2

-7

200

4/5n

n = -2/3

-8/15

300

7.2/n - 3.6

n = 2

0

400

3/4n - 1/5

n = 5

3 11/20

500

n² + 5(-3)

n = -3

-6

Writing Equations

100

four more than twice a number equals 10

2n + 4 = 10

200

5 less than 3 times a number equals fifteen

3n - 5 = 15

300

eight more than the quotient of a number and five equals four

n/5 +8 = 4

400

one-half more than one-fourth times a number equals two-thirds

1/2 + 1/4n = 2/3

500

two-fifths less than the quotient of a number and six equals three-sevenths

n/6 - 2/5 = 3/7

Solving Equations

100

3n + 4 = 10

n = 2

200

7n - 4 = 17

n = 3

300

4.5n + 1.6 = 28.6

n = 6

400

n/3 - 5.7 = 2.3

n = 24

500

3/4n + 1/7 = 3 25/28

n = 5

Vocabulary

100

The missing value in an expression or equation

Variable

200

A group of numbers and/or variables used in an expression or equation.

Term

300

A group of terms and operations without an answer.

Expression

400

A number times itself.

Square

500

Two equivalent expressions.

Equation