Expressions vs. Equations

What is the most important difference between an expression and an equation?

• they're spelled different

• an equal sign

• only equations have variables

• only expressions have variables

Which of these can be written as an equation?

• Two times 0.75 plus m

• Three less than twice a

• Half the product of five and j

• Four times n is 24

Which of the following is an expression?

• 2x = 4

• 5 + 7

• 5 + x = 13

• 3 + 6 = 9

Which of the following is an equation?

• 5 + 8 = 13

• 2x + 3

• 5 + 9

• 3 + x

the difference of 100 and w 

• 100 + w 
• 100 / (6 + w)
• 100  - w
• 100 / 6 + w 

The sum of 6 and x is 11

• x + 6 = 11

• 6/x = 11

• x - 6 = 11

• 6x = 11

Write the phrase as an expression:

twenty times a number

• 20 + x

• x - 20

• 20x

• x/20

What is the quotient of y and 5?

• y - 5
• y + 5
• y X 5

A number decreased by 9

• 9 - x
• x + 9
• x/9
• x - 9

the product of 7 and a number is 21

• 7 + x = 21

• 7 - x = 21

• 7x = 21

• x/7 = 21