Percent of Change. Percent of change -Ratio that compares the changes in quantity to the original amount Percent of change - Percent of increase - Percent.

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Presentation transcript:

Percent of Change

Percent of change -Ratio that compares the changes in quantity to the original amount Percent of change - Percent of increase - Percent of decrease - Original amount increased Original amount decreased

Determine the percent of change. EX1) EX2) The stereo cost $125 to make and is sold for $205. Step 1Subtract Step 2Form ratio Step 3Simplify Step 4Make a percent The original cost of the phone was $225 and was put on sale for $90. Step 5Determine increase or decrease increase decrease

Ex 3) The dimensions of the rectangle are decreased by 30%. Determine the percent of change in the area of the rectangle. 8 6 Step1Determine dimensions of the smaller rectangle Step2Find area of both rectangles Step3Determine percent decrease in areas 6 x x 0.3 = 1.8 = x x 5.6 = 48 = – 23.52= = 51% 6 – – 2.4 = 4.2 = 5.6

Assignment Page 263 Problems 2-10, 11, 13

notes

Percent of Change Date _____________

Percent of change - Percent of increase - Percent of decrease -

Determine the percent of change. EX1) EX2) The stereo cost $____ to make and is sold for $_____. Step 1 Step 2 Step 3 Step 4 The original cost of the phone was $___ and was put on sale for $___. Step 5

Ex 3) The dimensions of the rectangle are decreased by 30%. Determine the percent of change in the area of the rectangle. 8 6 Step1Determine dimensions of the smaller rectangle Step2Find area of both rectangles Step3Determine percent decrease in areas