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Do Now. Write each proportion and answer. 54% of the 1,250 kids at Park Ave. have some computer restrictions at home. Determine what part of the population that is. 74% of 12 year olds use IM. Predict how many of the 2,480 middle school kids that is. Chapter 8 Lesson 4 Percent of Change.

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Do Now

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  1. Do Now Write each proportion and answer. • 54% of the 1,250 kids at Park Ave. have some computer restrictions at home. Determine what part of the population that is. • 74% of 12 year olds use IM. Predict how many of the 2,480 middle school kids that is.

  2. Chapter 8Lesson 4Percent of Change Objective: Find the percent of increase or decrease

  3. Percent Change Is a ratio that compares the change in quantity to the original amount. amount of change original amount Percent of change =

  4. Percent Increase The original quantity is increased amount of change original amount (New amount – original amount) Percent of change =

  5. Percent Decreased The original quantity is decreased. amount of decrease original amount (Original amount – new amount) Percent of change =

  6. Find the percent of change in tree height from one year to year 10. Round to the nearest whole percent if necessary. Percent of increase amount of change original amount Percent of change = 9.6 - 4 = 5.6 5.6 4 9.6 ft 1.4 4 ft 140% The percent of increase in the tree height is 140%

  7. Find the percent of change if the original price of a stock was $75 and the new price is $60. Round to the nearest whole percent if necessary. Percent of Decrease amount of decrease original amount Percent of change = 75 – 60 = $15 15 75 0.2 20%

  8. Find each percent of change. Round to the nearest whole percent if necessary. State whether the percent of change is an increase or decrease. Original: 10 New: 13 Increase 13 -10 = 3 3 10 30%

  9. Find each percent of change. Round to the nearest whole percent if necessary. State whether the percent of change is an increase or decrease. Original: 20 New: 15 decrease 20 - 15 5 20 25%

  10. Find each percent of change. Round to the nearest whole percent if necessary. State whether the percent of change is an increase or decrease. Original: 30 New: 24 decrease 30 – 24 = 6 6 30 20%

  11. Find each percent of change. Round to the nearest whole percent if necessary. State whether the percent of change is an increase or decrease. Original: $75.80 New: $94.70 Increase $94.70 – 75.80 = $18.90 18.90 75.80 .249340 = 25%

  12. Find each percent of change. Round to the nearest whole percent if necessary. State whether the percent of change is an increase or decrease. Original: $126 New: $150 Increase 150 – 126 = 24 24 126 .1904 = 19%

  13. Find each percent of change. Round to the nearest whole percent if necessary. State whether the percent of change is an increase or decrease. Original: 1.6 New: 0.95 decrease 1.6 – 9.95 = .65 .65 1.6 0.40625 = 41%

  14. Find each percent of change. Round to the nearest whole percent if necessary. State whether the percent of change is an increase or decrease. Original: 624 New: 702 Increase 702 – 624 = 78 78 624 0.125 = 13%

  15. Do numbers 11-21 odd on page 352 in your textbook

  16. Homework Page 352 numbers 12 – 22 even.

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