Calculating Percentage of a Whole

What is 9% of 200?

• 100

• 18

• 20

In a class of 30 kids, 3 forgot to get their report cards signed. What percent is that?

• 3%

• 30%

• 10%

• 70%

Name the two steps to calculating a percent of a number

• Cross multiply then divide

• Change the decimal to a percent then cross multiply

• Change the percent to a decimal then divide

• Change the percent to a decimal then multiply

What is the 15% discount on this stove?

• 49.85

• 59.85

• 69.85

• 79.85

What is the percentage savings on the sofa?

• 15%

• 25%

• 30%

What will the new price for the mirror be after the discount?

• 25%

• $12.50

• $37.50

• $50.00

When calculating Part to Whole

• The Part goes in the denominator

• Change the decimal to a percent and multiply

• Use the No-No Rule

• Set it up as a proportion equal to x over 100

50% of 1200

• 500

• 600

• 400

• 300

25% of 2000

• 500

• 1000

• 250

• 1500

70% of 2000

• 1400

• 2000

• 700

• 270