Percent Of Change

Chapter 6, Section 7: Percent of Change
Warm Up: Write each decimal as a percent.
0.46
2.47
0.03
5.236
46%
247%
3%
523.6%

Finding Percent of Increase
The percent an amount increases or decreases from its original amount is the percent of change .
So Percent of Change =
amount of change original amount

Find the percent of increase from 4 to 7.5
1 st : amount of increase: 7.5 – 4 = 3.5
2 nd : set up fraction.
Percent of increase =
amount of change original amount Divide to find the decimal. Move decimal 2 places to the right Percent increase from 4 to 7.5 is 87.5% 7.5 – 4 4 = 3.5 4 = 0.875 = 87.5%

Try These: Find each percent of increase.
From 100 to 114
From 2.0 to 3.2
From 4,000 to 8,500
14% 60% 112.5%

Word Problem
The annual production of video games in the United States has more than doubled since the 1960s. Find the percent of increase from 1960 to 1990.
Percent of increase from 1960-1990 was about 133%. 205,000 1990 88,000 1960 Number of Video Games Produced Year

Finding Percent of Decrease
Percent of Decrease is found the SAME way that Percent of Increase is.
1 st : Find Percent of Decrease.
Subtract both numbers being compared.
2 nd : Amount of Decrease
Original Amount
3 rd : Divide and move decimal 2 places to the right.

Find each percent of decrease. Round to nearest tenth.
From 9.6 to 4.8
From 202 to 192
From 854.5 to 60.6
50% 5% 92.9%

Word Problem
A computer that costs $875 last year costs $745 this year. Find the percent of decrease to the nearest percent.
14.85%

Assignment #23
Page 318: 6-36 all.
www.phschool.com
Code: awe-0607

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Percent Of Change

by Middle School on Mar 31, 2010

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