Quiz Reviewer: Expressions and Equations

Vocabulary

100

This type of math problem has no equal sign.

Expression

200

This type of math problem has an equal sign.

Equation

300

Another word for numbers used in expressions and equations

Constant

400

Another word for the letters used in expressions and equations.

Variable

500

The number in front of a variable is called this.

Coefficient

Writing Expressions

100

a number x plus five

x+5

200

the quotient of 100 and a number y

100/y

300

forty minus a number b

40-b

400

the sum of eleven and a number f

11+f

500

a number m less than twenty

20 - m

Solving equations

100

x/10 = 3

x = 30

200

8x = 80

x = 10

300

x + 5 = 14

x = 9

400

4x = 52

x = 13

500

3x - 10 = 20

x = 10

Evaluate Expressions

100

x - 5 , x = 12

7

200

2x , x = 15

30

300

5x - 2, x = 4

18

400

x + 20, x = 11

31

500

10x, x = 7

70

Word Problems

100

Tanya is 5 years old more than Timmy. If Timmy is 16, how old is Tanya?

x = Timmy's age = 16

Tanya's Age = x + 5

Tanya's Age = 16 + 5 = 21

Tanya is 21 years old

200

A dog is thrice a cat's age. 

If a cat is 2 months old, how old is the dog?

x = cat's age = 2 months

Dog's Age = 3x

Dog's age = 3(2) = 6

The dog is 6 months old.

300

The temperature today is 10 degrees lower than the temperature yesterday. If it was 45 degrees yesterday, what is the temperature today?

y = temperature yesterday

temperature today = y - 10

yesterday's temperature = 45 

today's temperature = 45-10 = 35 degrees.

400

give the equivalent expression to:

x + x + x + 10 - 5

3x + 5

500

The length of a rectangular room is x meters while its width is 8. If x = 5 meters. What is the area of the room?

Area = L x W

        = x (8)

x = 5 meters, so:

         = 5(8) 

Area = 40 sq meters