Solve Percent Proportions

Write an equation for:
Thirty-three is what percent of 100?

• 33x = 100

• .33(100) = x

• 33 = x(100)

Write the ratio as a percent and then as a decimal:
1/4

• 25%, .25

• 400%, 4

• 25%, 25

• 400%, 40

Write the ratio as a percent and then as a decimal:
18/4

• 450%, 4.5

• 450%, 450

• 22%, .22

• .22%, 22

Write an equation to represent:
Fourty is what percent of 90?

• 40 = 90x

• (90)(40) = x

• 40x = 90

Write the ratio as a percent and then as a decimal:
34/100

• 34, 34

• 34%, .34

• 34%, .34

26 is 5% of what number?

• 3

• 5

• 25.95

• 520

 Shirley spelled 12 of her 15 spelling words correctly on the test.  What percent grade did Shirley get on the test?

• 40%

• 50%

• 80%

• 60%

In Will’s garden, 71 out of 200 plants have developed seeds. What percent is that?

• 20%

• 25½%

• 35½%

• 70%

What percent of 50 is 20?

• 40%

• 25%

• 2.5%

• 4%

What is 40% of 230?

• 92

• 9200

• 9.20

• 575