Identifying Equivalent Mathematical Expressions with Variables

Write the phrase as an expression:

twenty times a number

• 20 + x

• x - 20

• 20x

• x/20

In the expression below what is the "d" labeled as?

4d-9

• dirt

• donuts

• variable

• constant

Write the phrase as an expression:

the sum of a number and five

• x + 5

• x - 5

• 5x

• x/5

Write the phrase as an expression:

the product of a number and eight

• x + 8

• x - 8

• 8x

• 8/x

Write the phrase as an expression:

the quotient of a number and twelve

• x + 12

• x - 12

• 12x

• x/12

Write the phrase as an expression:

twice a number plus six

• 2x + 6

• 2x - 6

• 2x / 6

• 2x (6)

Six less than a number k

• k - 6

• 6 + k

• 6/k

• 6 - k

Half a number y

• 2y

• y/2

• y + 1/2

• y - 1/2

The product of seven and a number increased by five

• 7+n+5

• 7/n+5

• 7n+5

• 7-n+5

A number decreased by 9

• 9 - x

• x + 9

• x/9

• x - 9