Increasing and Decreasing

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Draw Diagrams to Represent Percentage Change.

Draw a diagram 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.

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

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Observe Changes in Data.

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

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

(2). Which team improved the most? Explain your reasoning.

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Determine Percentage Increase or Decrease.

(A). Look at the diagram and decide if is an increase or a decrease relative to . Then determine the percent increase or decrease.

Explain your answer.

(B). Look at the diagram and decide if is an increase or a decrease relative to . Then determine the percent increase or decrease.

Explain your answer.

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

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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, .