7th Grade Math

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Applying Percents

PART A BCDE F

Multi-Part

Lesson 3

GLE 0706.2.4

Use ratios, rates and

percents to solve single-

and multi-step problems

in various contexts. Also

addresses GLE 0706.1.8.

Lesson 3A Applying Percents 345

Percent of Change

ADMISSION The admission price for the state fair has increased by

50% in the last five years. If the admission price was $6 five years

ago, what is the current admission price?

What do you need to find? current admission price for the state

fair after a 50% increase

Draw a bar diagram that will represent 100%. Cut it out

and label it.

Draw a second bar diagram that is half the length of

the first. It represents 50%. Cut it out and label it.

Tape the two bars together, end to end. This new bar

represents a 50% increase or 150% of the first bar.

price 5 years ago = $6 increase = $3 150 %

The current admission price for the state fair is $6 + $3 or $9.

the Results

1. Suppose the price had increased 10%. What would you do
   differently in Step 2? What is the new admission price?


2. Describe how this process would change to show percent of
   decrease.

and Apply

3. Model each percent of change with bar diagrams.
   a. 25% increase b. 75% increase
   c. 30% decrease d. 40% decrease

Main Idea

Use bar diagrams

to solve problems

involving percent

of change.

price 5 years ago = $6 100%

increase = $3 50%

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