Percentage Increases and Discounts

This lesson covers the use of percentages to describe increases and decreases in various contexts. It begins with an activity analyzing sports scores, followed by examples of calculating percentage increases and decreases using a cereal box and shirt price. The lesson also includes using tape diagrams for visual understanding and a discussion activity to explore different perspectives on percentage changes. The session concludes with a review of homework problems.

What is the percentage increase in the baseball team's score from game one to game two?

• 400%

• 100%

• 300%

• 200%

If a cereal box originally contained 18.5 oz and now has 22.2 oz, what is the percentage increase?

• 15%

• 20%

• 25%

• 10%

A shirt originally costs $18.50. After a 20% discount, what is the new price?

• $16.80

• $15.80

• $14.80

• $17.80

If the number of ducks at a pond increases by 40%, what is the new percentage of the original number?

• 130%

• 120%

• 140%

• 150%

What does a 100% decrease in a quantity mean?

• The quantity doubles

• The quantity is halved

• The quantity remains the same

• The quantity becomes zero

If employee A gets a 50% raise and employee B gets a 45% raise, who gets a bigger raise?

• Employee B

• Cannot be determined

• Employee A

• Both get the same raise

If two shirts are each 20% off, what is the total discount on the purchase?

• 20%

• 30%

• 40%

• 50%

What is the percentage of sunny days this year if there are 25% fewer than last year?

• 50%

• 60%

• 75%

• 80%

If a bakery uses 40% more flour this month than last month, what percentage of last month's flour is used this month?

• 150%

• 120%

• 130%

• 140%

If a runner's time is 10% less than last time, what percentage of the original time is the new time?

• 80%

• 90%

• 85%

• 95%