Monday, March 10th - Percent Change Notes

Untitled Lesson

By Laura Goblirsch

Multiple Choice

When is the next quiz?

• Tomorrow, 3/11

• Wednesday, 3/12

• Thursday, 3/13

• Friday, 3/14

Warm up

Poll

Does the table in the warm up have a constant rate of change?

• Yes

• No

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Multiple Choice

How do you find k?

(constant of proportionality)

• $$x=yk$$

• $$k=\frac{x}{y}$$

• $$k=\frac{y}{x}$$

• $$y=kx$$

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Multiple Select

What is the percent change formula?

Select all that apply.

• $$\frac{new-old}{old}$$

• $$\frac{old-new}{new}$$

• $$\frac{amount\ of\ change}{original\ amount}$$

• $$\frac{original\ amount}{amount\ of\ change}$$

Reorder

Put the steps to find the percent change in the correct order.

• Identify the new and old values.

• Substitute values in the formula.

• Solve by subtracting first, then divide.

• Change the answer into a percent. (multiply by 100)

• Label it as a percent increase or percent decrease.

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Dropdown

Percent​

Select answer

is a value that goes up from the starting value.

Percent ​

Select answer

is a value that goes down from the starting value.

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Multiple Choice

Which of the following is the correct set up for the first example?

From 36 to 45.

• $$\frac{45-36}{36}$$

• $$\frac{45-36}{45}$$

Fill in the Blanks

What is the percent change of example 1?

From 36 to 45.

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Fill in the Blanks

What is the percent change of example 2?

From 55 to 44.

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Fill in the Blanks

What is the percent change of example 3?

From 40 to 59.

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Fill in the Blanks

What is the percent change of example 4?

From 21 to 7. Round to the nearest tenth.

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Multiple Choice

When finding the new amount of something, how do you find the amount of change?

• Divide the percent (as a decimal) by the original (old) value.

• Multiply the percent (as a decimal) by the original (old) value.

• Multiply the percent (as a percent) by the original (old) value.

• Multiply the percent (as a decimal) by the ending (new) value.

Dropdown

When there is a percent increase, I need to ​

Select answer

the amount of change to the ​

Select answer

value to find the new value.

When there is a percent decrease, I need to ​

Select answer

the amount of change from the ​

Select answer

value to find the new value.

Dropdown

Example 1: 48 cookies; 25% decrease.



In this problem, the original value is ​

Select answer

cookies. The percent as a decimal is ​

Select answer

. Since the problem is a decrease, I will need to ​

Select answer

the amount of change from the original value.

Open Ended

Example 1: 48 cookies; 25% decrease.

How many cookies are there now?

Use the sentence frame: There are ___ cookies left.

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Open Ended

Example 2: A television is $499. The price is increased by 10%.

What is the new price of the tv?

Use the sentence frame: The new tv is...

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Open Ended

Example 3: There were 28 members but 50% left the meeting.

How many members are left at the meeting?

Use the sentence frame: There are ___ members left.

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Open Ended

Example 4:

The grizzly bear population in Yellowstone National Park in 1970 was about 270. Over the next 35 years, it increased by about 115%.

What was the population in 2005? You will want to round to the nearest grizzly bear.

Use the sentence frame: The grizzly bear population in 2005 was ___ bears.

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Percent Change Google Form

Now that you have finished your notes, you can get started on today's assignment. There is a google form posted on google classroom. Use your notes and box paper to complete the assignment.