**Warmup**

**Activity #1**

** Draw Diagram to Represent Percentage Change.**

The number of miles driven this month was a 30% decrease of the number of miles driven last month.

- Draw a diagram to represent the situation.

The amount of paper that the copy shop used this month was a 25% increase of the amount of paper they used last month.

- Draw a diagram to represent the situation.

**Activity #2**

**Finding Percentage Change.**

- Select whether you want a percentage increase or decrease by clicking on the appropriate box. A slider is introduced.
- Check the “Question” box if you wish to use a provided question.
- Read the question and type in the amount representing 100% in the “Total” box. The amount that is given in the problem.
- In the “percentage change” box, type in the required value given in the problem, and press the Enter key.
- Move the slider to the right to “shift” this amount to the other end of the bar.
- Check the “Show change” box to highlight the new amount.
- Check the “Answer” box if you used the provided question to see the answer to the problem.
- Click on the button to get a new question. Take note that, regardless of which choice you made at the beginning, the same steps will apply.

**Activity #3**

** Demonstrate Percentage Increase and Decrease.**

- Check the first box to start with percentage increase.
- Move the slider to see percentage increase on the bar and how it is found.
- Uncheck the box and check the second box to observe percentage decrease. If you run out of screen space, use your mouse to enable zoom.
- Move the slider to see percentage decrease on the bar and how it is calculated.

**Challenge #1**

An astronaut was exploring the moon of a distant planet, and found some glowing goo at the bottom of a very deep crater. She brought a 10 gram sample of the goo to her laboratory. She found that when the goo was exposed to light, the total amount of goo increased by 100% every hour.

**Challenge #2**

**Challenge #3**

In a video game, Clare scored 50% more points than Tyler. If *c* is the number of points that Clare scored and is the number of points that Tyler scored, which equations are correct?

**Quiz Time**

https://www.ixl.com/math/grade-7/percent-of-change-find-the-original-amount-word-problems

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