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IM: 7.4.6: Increasing and Decreasing (Lesson)

By Newsela Staff
Last updated 6 days ago
13 Questions
6.1: Improving Their Game
Here are the scores from 3 different sports teams from their last 2 games.

What do you notice about the teams’ scores? What do you wonder?

Which team improved the most? Explain your reasoning.

6.2: More Cereal and a Discounted Shirt

A cereal box says that now it contains 20% more. Originally, it came with 18.5 ounces of cereal. How much cereal does the box come with now?

The price of a shirt is $18.50, but you have a coupon that lowers the price by 20%. What is the price of the shirt after using the coupon?

6.3: Using Tape Diagrams
Match each situation to a diagram. Be prepared to explain your reasoning.


Compared with last year’s strawberry harvest, this year’s strawberry harvest is a 25% increase.

This year’s blueberry harvest is 75% of last year’s.

Compared with last year, this year’s peach harvest decreased 25%.

This year’s plum harvest is 125% of last year’s plum harvest.

Draw a diagram to represent these situations.

The number of ducks living at the pond increased by 40%.

The number of mosquitoes decreased by 80%.

What could it mean to say there is a 100% decrease in a quantity? Give an example of a quantity where this makes sense.

6.4: Agree or Disagree: Percentages
Do you agree or disagree with each statement? Explain your reasoning.

Employee A gets a pay raise of 50%. Employee B gets a pay raise of 45%. So Employee A gets the bigger pay raise.

Shirts are on sale for 20% off. You buy two of them. As you pay, the cashier says, “20% off of each shirt means 40% off of the total price.”