Expressions

What is the variable in the expression 16r - 3

• 16

• r

• -

• 3

When are variables used in mathematical expressions?

• When quantities are changing

• When quantities are constant

• When quantities are unknown

• When quantities are known

Match the word problem with the expression:
Each day of the week I work the same number of hours.

• 7y

• y + 7x

• 7 ÷ y

Which represents the unknown value in the following statement? 
7 + j = 15

• 7

• +

• j

• 12

In the expression i + 4, the letter i represents

• a number sentence

• an open sentence

• an addition symbol

• an unknown number

In the expression 77x - 60, the letter x represents 

• a variable

• a known number

• an expression

• a number sentence

Write a verbal expression for:

5x + 2

• five times the sum of a number x and two

• two times the sum of a number x and five

• a number x times the sum of five and two

• the sum of five times a number x and two

Write a verbal expression for:

3m = 15

• 3 increased by a number is 15

• 15 increased by a number is 3

• The difference between 15 and a number is 15

• 3 times a number is 15

Which is the variable in the equation g + 3 = 7

• g

• +

• 3

• 7

What represents the unknown in 4y - 18 = 22

• 22

• -

• y

• =