Assignment # ______Percent of Change Name ______
Standard: NS 1.6 Calculate the percent of decrease Pre-Algebra, Period ______and increase of a quantity Date ______
Amount of decrease To find the PERCENT of decrease, compare Original amount the amount of decrease to the original amount.
Wilasha’s dog weighed 120 pounds at the beginning of the year and 90 pounds by the end of the year. By what percent did the dog’s weight decrease?
120 – 90 = 30 Find the amount of decrease
30 amount of decrease 120 original amount 120)30 = .25 = 25%
The percent of decrease is 25%
Find each percent of decrease. 6. A Nintendo DS videogame was originally $35 dollars. The sale price was $28. 1. From $45 to $27. ______What was the percent of discount?
2. From $80 to $60. ______
7. The 7th and 8th grade enrollment at Adams middle dropped from 500 students to 350 students. By what percent did the 3. $60 is decreased to $15. ______enrollment drop?
4. $98 is decreased to $49. ______
8. A store marked down a television from $800 to $600. What percent did they mark down the television? 5. Mr. Lau started with 36 students, but had 27 by the end of the quarter. What percentage of his students left? Percent of Increase
Amount of increase To find the PERCENT of INCREASE, compare Original amount the amount of increase to the original amount.
Willie weighed 80 pounds at the beginning of the year and 92 pounds by the end of the year. By what percent did his weight increase?
92 – 80 = 12 Find the amount of increase
12 amount of increase 80 original amount 80)12 = .15 = 15%
The percent of increase is 15%
Find each percent of increase. 14. A store marked up a television from $600 to $750. What is the percent of markup? 9. 40 is increased to 50. ______
10. From $25 to $35. ______
15. The 7th and 8th grade enrollment at Adams middle grew from 440 students to 528 students. By what percent did the enrollment grow? 11. From $120 to $150. ______
12. $72 is increased to $135. ______
16. Between 1978 and 1997 the price of gasoline increased from about $.65 a 13. Life expectancy in the U.S. increased gallon to about $1.30. By what percent from about 50 years to 80 years during did the price of gasoline increase? the 20th century. Find the percent of increase to the nearest percent.