The document contains examples of calculating percent change and percent error. One example shows that the price of a skirt decreasing from $32.95 to $28.95 is a 12% decrease. Another example shows the federal budget increasing from $9.5 billion to $725.3 billion is nearly a 7535% increase. The document also provides examples of finding the maximum and minimum values and percent error when measurements are rounded to a certain precision.
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3-7 Percent change and error
1. Percent of Change
Lesson 3-7
Additional Examples
Algebra 1
The price of a skirt decreased from $32.95 to $28.95. Find
the percent of decrease.
amount of change
percent of decrease = original amount
32.95 – 28.95 Subtract to find the amount of change.
= 32.95 Substitute the original amount.
4
= 32.95
Simplify the numerator.
0.12 or 12% Write as a decimal and then as a percent.
The price of the skirt decreased by about 12%.
2. Percent of Change
Lesson 3-7
Additional Examples
Algebra 1
Between 1940 and 1980, the federal budget increased from
$9.5 billion to $725.3 billion. What was the percent of increase in the
federal budget?
amount of change
percent of increase = original amount
725.3 – 9.5
= 9.5
Substitute.
715.8
= 9.5
Simplify the numerator.
= 75.35 or 7535% Write as a decimal and then
as a percent.
The federal budget increased nearly 7535%.
3. Percent of Change
Lesson 3-7
Additional Examples
Algebra 1
You read the bathroom scale as 122 lb. What is your greatest
possible error?
The scale is read to the nearest 1 lb, so the greatest possible
error is one half of 1 lb, or 0.5 lb.
4. Percent of Change
Lesson 3-7
Additional Examples
Algebra 1
When a garden plot was measured, the dimensions were
156 in. × 84 in. Use the greatest possible error to find the minimum
and maximum possible areas.
Both measurements were made to the nearest whole inch, so the greatest
possible error is 0.5 in.
The length could be as little as 155.5 in. or as great as 156.5 in.
The width could be as little as 83.5 in. or as great as 84.5 in. Find the
minimum and maximum areas.
Minimum Area Maximum Area
155.5 in. × 83.5 in. = 12,984.25 in.2 156.5 in. × 84.5 in. = 13,224.25 in.2
The minimum area is 12,984.25 in.2, and the maximum area is 13,224.25 in.2.
5. Percent of Change
Lesson 3-7
Additional Examples
Algebra 1
Suppose you measure a library book and record its width as
17.6 cm. Find the percent of error in your measurement.
Since the measurement is to the nearest 0.1 cm, the greatest possible
error is 0.05 cm.
greatest possible error
percent error = measurement
Use the percent error formula.
0.05
= 17.6 Substitute.
0.0028409091 Divide.
= 0.3% Round and write as a percent.
The percent error is about 0.3%.
6. Percent of Change
Lesson 3-7
Additional Examples
Algebra 1
A small jewelry box measures 7.4 cm by 12.2 cm by 4.2 cm.
Find the percent error in calculating its volume.
The measurements are to the nearest 0.1 cm. The greatest possible error
is 0.05 cm.
as measured maximum value minimum value
V= •w•h V= •w•h V= •w•h
= 7.4 • 12.2 • 4.2 = 7.45 • 12.25 • 4.25 = 7.35 • 12.15 • 4.15
= 379.18 cm3 = 387.87 = 370.61
Possible Error: maximum – measured measured – minimum
387.87 – 379.18 = 8.69 379 – 370.61 = 8.57
7. Percent of Change
Lesson 3-7
Additional Examples
Algebra 1
(continued)
Use the difference that shows the greatest possible error to find the
percent error.
greatest possible error
percent error = measurement
Use the percent error formula.
387.87 – 379.18
= 379.18 Substitute.
8.69
= 379.18 Simplify the numerator.
= 0.0229178754 Write as a decimal.
= 2% Round and write as a percent.
The percent error is about 2%.