6.4 Percent Increase or Decrease Notes
Learning Target: Find percents of change in quantities.
6.4 Percent Increase or Decrease
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Percent of Increase
A percent of change is the percent that a quantitychanges from the original amount.
Key Idea:
Percent of Change=Amount of Change
=
New amount - Original Amount
Original Amount
Original Amount
Percent of Increase=new amount-original amount
Saturday
Sunday
Percent of increase = 4.5 - 2
Day
4.5
Hours 
on Line
2
The table shows the
number of hours spent
online.
1.25, is 125%
original amount
=
2.5
?
2
?
2
So, there is a 125% increase in time spent on theinternet.
We could write it as +125%
Find the Percent Change.
Round to the nearest tenth of a percent.
=
% of Change= New amount - Original Amount
15
10
25 inches - 10 inches
10 inches to 25 inches
10 inches
1.5
?
So, it is a 150% increase
Original Amount
150
?
%
Find the Percent Change.
Round to the nearest tenth of a percent.
=
% of Change= New amount - Original Amount
 857
65 people - 57 people
57 people
57 people to 65 people
0.1403508
(Round)
.14
?
Original Amount
0.1403508
(Round)
14.0
?
%
Finding Percent  of Decrease
=
Compare 2016 and 2017
=
0.2857142
=
28 - 20
   28
 828
(Round)
Round to the Nearest Tenth of the Percent
12 inches to 36 inches
Finding the Percent Change
%
Decrease
Increase
75 people to 25 people
Round to the Nearest Tenth of the Percent
Finding the Percent Change
%
Decrease
Increase
50 pounds to 35 pounds
Round to the Nearest Tenth of the Percent
Finding the Percent Change
%
Decrease
Increase
Round to the Nearest Tenth of the Percent
24 songs to 78 songs
Finding the Percent Change
%
Decrease
Increase
Round to the Nearest Tenth of the Percent
10 gallons to 24 gallons
Finding the Percent Change
%
Decrease
Increase
72 paper clips to 63 paper clips
Round to the Nearest Tenth of the Percent
Finding the Percent Change
%
Decrease
Increase
16 centimeter to 44.2 centimeter
Round to the Nearest Tenth of the Percent
Finding the Percent Change
%
Decrease
Increase
Round to the Nearest Tenth of the Percent
68 miles to 42.5
Finding the Percent Change
%
Decrease
Increase
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