Lesson 20 S1 (New Books)

Multiple Choice

Which of the following is NOT typically solved using percent calculations in everyday life?

• Calculating sales tax on a purchase

• Finding the tip at a restaurant

• Measuring the length of a pencil

• Determining the amount of discount during a sale

Multiple Choice

Which of the following statements about percents is true?

• 60% of 40 is 24.

• 40% of 80 is 50.

• 30% of 70 is the same as 3/7 of 70.

• 40% of 70 is the same as 2/5 of 70.

Multiple Choice

Which of the following is the only representation without numbers?

• 25%

• 1/4

• 0.25

• Shaded circle

Multiple Select

Which of the following representations use the digits 2 and 5?

• 25%

• 1/4

• 0.25

• Shaded circle

Open Ended

Last year, a middle school band had 80 students. This year, the band has 120% of that number of students. How many students are in the band this year?

Open Ended

How did you get started finding the number of students?

Multiple Select

Which of the following strategies can be used to find 120% of 80?

• Divide 80 by 2 and add to 80

• Multiply 80 by 1.2

• Subtract 20% of 80 from 80

• Add 20% of 80 to 80

Multiple Choice

Which of the following is the correct formula for calculating simple interest?

• I = Prt

• I = P + rt

• I = P/r + t

• I = Pr/t

Open Ended

Suppose you borrow $300 at a yearly, or annual, simple interest rate of 3.4% for 3 years. What values would you use for P, r, and t?

Multiple Choice

Which formula is used to calculate simple interest?

• I = Prt

• I = P + rt

• I = Pr + t

• I = Pt / r

Multiple Choice

Is putting an item on sale for 25% off an example of a markup or a markdown?

• Markup

• Markdown

• Tax

• Commission

Multiple Choice

Suppose you pay a 7% tax on an item. What percent of the price of the item will you pay in total?

• 100%

• 107%

• 7%

• 93%

Open Ended

Explain how proportional relationships can be used to solve problems involving tax, tip, commission, markup, markdown, discount, and simple interest in real-world situations.

Open Ended

Is it possible for a single price change to be both a markup and a markdown? Explain your thinking.

Multiple Choice

Which of the following best describes the difference between a markup and a markdown?

• A markup is an increase in price, while a markdown is a decrease.

• A markup is a decrease in price, while a markdown is an increase.

• Both markup and markdown are increases in price.

• Both markup and markdown are decreases in price.

Open Ended

Explain why a single price change cannot be both a markup and a markdown.

Multiple Select

Which of the following are correct ways to calculate 125% of 40?

• Multiply 40 by 1.25

• Add 25% of 40 to 40

• Divide 40 by 1.25

• Multiply 40 by 125

Multiple Choice

If last year a rapper performed 40 times and this year performs 125% of that number, how many times does the rapper perform this year?

• 40

• 45

• 50

• 55

Open Ended

Is Isabel correct in saying that 0.02 can be expressed as 20%? Explain why or why not.

Multiple Choice

Starting money = $350.

Interest rate = 2.5%

TIme = 3 years.

How much is the total balance?

• $376.25

• $26.25

• $87.5

• $323.75