3-7 Percent Change
Objectives
1. TSW calculate the percent change
2. TSW find the greatest possible error
3. TSW find the maximum and minimum areas
Vocabulary
1. Percent of change –
2. Greatest possible error – one half of the measuring unit.
3. Percent error –
Finding Percent of Change
1. The price of a sweater decreased from $29.99 to $24.49. Find the
percent of decrease.
2. Find the percent of increase if the price of a CD went from $12.99 to
$13.99
3. The number of alpaca owners increased from 146 in 1991 to 2919 in
2000. Find the percent increase
Greatest Possible Error
1. You find the mass of a rock. It is 3.8 grams. What is the GPE?
2. You measure a picture for the yearbook and record its height as 9cm.
What is the GPE?
Maximum and Minimum Area
- Find the GPE
- Subtract it from measurement to find Min Area
- Add to measurements to find Max Area
You measure a room to be 13 ft by 7 ft. Find the Max and Min Area
Finding Percent Error
You measure a CD and record its diameter as 12.1 cm. Find the percent error
in your measurement.