### Percent of change powerpoint

```PERCENT CHANGE
Unit 6
Math 7
Percent of Change
Important Vocabulary:
 Percent of Change –
 Amount
a quantity increases or decreases from its
original amount

To Find Percent of Change –
amountof change
 100
originalamount
Percent of Change
Percent Increase – Examples
 Find the percent change from 4 to 7.5
 Find
the difference of the two amounts:
7 .5  4
 Calculate
 3 .5
the percent of increase:
3.5
 0.875  100  87 .5%
4
There was an 87.5% increase.
Percent of Change
Percent Increase – Examples
 Find the percent increase from 8 to 9.6
 Find
the difference of the two amounts:
9 .6  8
 Calculate
1.6
8
 1 .6
the percent of increase:
 0 .2
 100  20 %
There was a 20% increase.
Percent of Change
Percent Increase – Examples
 Find the percent increase from 100 to 114
 Find
the difference of the two amounts:
114  100  14
 Calculate
14
100
the percent of increase:
 0.14
 100  14 %
There was a 14% increase.
Percent of Change
Percent Increase – Examples
 Find the percent increase from 2 to 3.2
 Find
the difference of the two amounts:
3 .2  2
 Calculate
1.2
2
 1 .2
the percent of increase:
 0 .6
 100  60 %
There was a 60% increase.
Percent of Change
Percent Decrease– Examples
 Find the percent decrease from 1,250 to 1,120
 Find
the difference of the two amounts:
1,120 1,250 130
 Calculate
the percent of decrease:
- 130
 0.104
1,250
 100  10.4%
There was a 10.4% decrease.
Percent of Change
Percent Decrease– Examples
 Find the percent decrease from 9.6 to 4.8
 Find
the difference of the two amounts:
4 .8  9 . 6
 Calculate
- 4.8
9.6
  4 .8
the percent of decrease:
  0 .5
 100  50%
There was a 50% decrease.
Percent of Change
Percent Decrease– Examples
 Find the percent decrease from 120 to 95
 Find
the difference of the two amounts:
95  120
 Calculate
 25
the percent of decrease:
- 25
 0.2083  100  20.83%
120
There was a 20.83% decrease.
Percent of Change
Percent Change – Examples
 In a given year, Hillsborough had a total of 7.5
inches of rain by March 1 and a total of 22.5 inches
by July 1. Find the percent of increase from 7.5 to
22.5.
 Find
the difference of the two amounts:
22.5  7.5
 Calculate
15
7.5
 15
the percent of increase:
 2 .0
 100
 200 %
There was a 200% increase in rain between March and
July.
Percent of Change
Percent Change – Examples
 The average cost of a gallon of gasoline increased to
\$2.99 per gallon from \$2.85. Find the percent
change.
 Find
the difference of the two amounts:
2.99  2.85  .14
 Calculate
.14
2.85
the percent change:
 0.049
 100
 4.9%
There was a 4.9% increase in gasoline prices.
```