Percent of Change.

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Presentation transcript:

Percent of Change

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

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

Ex 3) The dimensions of the rectangle are decreased by 30%. Determine the percent of change in the area of the rectangle. 6 8 Step1 Determine dimensions of the smaller rectangle 6 x 0.3 = 1.8 6 – 1.8 = 4.2 8 x 0.3 = 2.4 8 – 2.4 = 5.6 Step2 Find area of both rectangles 6 x 8 = 48 4.2 x 5.6 = 23.52 Step3 Determine percent decrease in areas 48 – 23.52 = 24.48 = 51%

Essential Question Explain how two amounts of change can be the same but the percents of change can be different?

Assignment Page 263 Problems 2-10, 11, 13

notes

Date _____________ Percent of Change

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

Determine the percent of change. EX1) The stereo cost $____ to make and is sold for $_____. Step 1 Step 2 Step 3 Step 4 EX2) 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. 6 8 Step1 Determine dimensions of the smaller rectangle Step2 Find area of both rectangles Step3 Determine percent decrease in areas

Essential Question Explain how two amounts of change can be the same but the percents of change can be different?