Increasing and Decreasing

Warmup

Activity #1

Draw Diagrams to Represent Percentage Change.

  • Draw a diagram in the applet below to represent each of the following situations: 
  1. The number of ducks living at the pond increased by 40%.​
  2. The number of mosquitoes decreased by 80%.​
  3. The amount of flour that the bakery used this month was a 50% increase relative to last month.​
  4. The amount of milk that the bakery used this month was a 75% decrease relative to last month.

(1.) What could it mean to say there is a 100% decrease in a quantity?

(2.) Give an example of a quantity where this makes sense.

Activity #2

Observe Changes in Data.

Here are the scores from 3 different sports teams from their last 2 games.

  • Study the scores and answer the questions below.

(1.) What do you notice about the teams’ scores?

(2.) Which team improved the most?

(3.) Explain your reasoning.

Activity #3

Determine Percentage Increase or Decrease.

  • Look at the diagram and decide if is an increase or a decrease relative to .

(1.) Determine the percent increase or decrease.

(2.) Explain your answer.

  • Look at the diagram and decide if is an increase or a decrease relative to .

(1.) Determine the percent increase or decrease.

(2.) Explain your answer.

Challenge #1

Select the situations that could be represented by the diagram below.

Challenge #2

Challenge #3

Priya bought grams of flour. Clare bought more than that. Select all equations that represent the relationship between the amount of flour that Priya bought, , and the amount of flour that Clare bought, .

Quiz Time

https://www.ixl.com/math/grade-7/percent-of-change