Lesson 8-4 Pages 350-353

Lesson 8-4 Pages 350-353

Percent of Change

Lesson Check 8-3

What you will learn!

How to find the percent of increase or decrease.

Percent of changePercent of change

Percent of increasePercent of increase

Percent of decreasePercent of decrease

What you really need to know!

A percent of change is a ratio that compares the change in quantity to the original amount. If the original quantity is increased, it is a percent of increase. If the original quantity is decreased, it is a percent of decrease.


amount Original

increase ofAmount increase ofPercent

amount Original

decrease ofAmount decrease ofPercent


Number Old

Number Old -Number New change ofPercent

Example 1:

Last year a sweater sold for $56. This year the same sweater sells for $60. Find the percent of change in the cost of the sweater. Round to the nearest whole percent if necessary.

amount Original


amount Original


56

56 - 60 increase ofPercent

%756

4 increase ofPercent

7% increase

Example 2:

On the first day of school this year, 435 students reported to Bellwood Middle School. Last year on the first day, 460 students attended. Find the percent of change for the first day attendance. Round to the nearest whole percent if necessary.

amount Original


amount Original


460

460-435 decrease ofPercent

%5460

25- decrease ofPercent

-5% decrease

Guided Practice

#’s 4-10

Pages 350-351 with someone at home and study

examples!

Read:

Homework: Page 352-353

#’s 12-30 even

#’s 33-41

Page 583 Lesson 8-4Lesson Check 8-4

Link to Lesson 8-4 Review Problems

Lesson 8-4

Lesson Check 8-4

Lesson 8-4 Pages 350-353

Documents

Transcript of Lesson 8-4 Pages 350-353