Multiplying Numbers and Percents

Brenna saved 36% on a $15 pair of sunglasses. Choose the correct expression to find 36% of $15.

• 36 × 15

• 36 × 0.15

• 3.6 × 15

• 0.36 × 15

Last year, Renata earned $540 delivering newspapers. This year, Renata made 250% of what she made last year.

Which steps should you take to find out how much money Renata made delivering newspapers this year? Check all that apply.

• Convert 250% to a decimal to get 0.25.

• Convert 250% to a decimal to get 2.50.

• Multiply 0.25 by 540 to get $135.

• Multiply 2.50 by 540 to get $1,350.

• Check your answer by using 100% + 100% + 50% to get 540 + 540 + 270.

Which steps should be followed to use multiplication to find 33% of 67?

• Convert 33% to the equivalent decimal 3,300, and then multiply 3,300 by 67 to get 221,100.

• Convert 33% to the equivalent decimal 0.33, and then multiply 0.33 by 67 to get 22.11.

• Convert 33% to the equivalent decimal 3.3, and then multiply 3.3 by 67 to get 221.1.

• Convert 33% to the equivalent decimal 0.33, and then multiply 0.33 by 0.67 to get 0.2211.

What is 160% of 40? Four students solved this problem and their work is shown below. Choose the student whose work is correct.

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Wanda's homework was to find 73% of $400

What error did Wanda make?

• None. Wanda’s work is correct.

• Wanda converted the percent to a decimal incorrectly. It should be 0.073.

• Wanda converted the percent to a decimal incorrectly. It should be 0.73.

• Wanda has the wrong label. It should be hours, not dollars.

Upton read 4 books this month. Next month, he hopes to read a number of books equal to 275% of the number he read this month.

Which steps would you take to find 275% of 4? Check all that apply.

• Find the decimal equivalent of 4%, or 0.4.

• Find the decimal equivalent of 275%, or 2.75.

• Multiply 0.4 by 275 to get 110 books.

• Multiply 2.75 by 4 to get 11 books.

• Estimate to check your answer by finding 300% of 4.

Last year, William made $620 babysitting. This year, he made 340% more money than he did last year. How much money did William make this year?

William made $____this year.

An advertisement reads “All Toys 35% Off.” How much money will you save if you buy a remote-control helicopter originally priced at $49?

• $14.00

• $17.15

• $20.00

• $31.85

Which correctly explains how to estimate 55 percent of 64?

• Round 55 percent to 40 percent and 64 to 60. Think of 40 percent as . So, of 60 is 15.

• Round 55 percent to 60 percent and 64 to 70. Think of 60 percent as . So, of 70 is 23.3.

• Round 55 percent to 50 percent and 64 to 70. Think of 50 percent as . So, of 60 is 12.

• Round 55 percent to 50 percent and 64 to 60. Think of 50 percent as . So, of 60 is 30.

What is 45 percent of 37?

• 0.1665

• 1.665

• 16.65

• 166.5