1. Percentage Increase and Decrease

2. Li planted a 12 foot tall tree in her yard. Ten years later it is 18 feet tall 12(1) + 12(1/2) amount of growth

3. Li planted a 12 foot tall tree in her yard. Ten years later it is 18 feet tall 12(1) + 12(1/2) amount of growth = 12(3/2) = 18

4. Li planted a 12 foot tall tree in her yard. Ten years later it is 18 feet tall 12(1) + 12(0.5) amount of growth = 12(1.5) = 18

5. 600(1) + 600(1/3) amount of growth = 600(4/3) = 800 Pedro had $600 in his savings account. Five years later he has $800

6. 600(1) + 600(.33) amount of growth = 600(1.33) = 800 Pedro had $600 in his savings account. Five years later he has $800

7. At the beginning of the year, there were 32 students in Ms. Durfee’s class. There are now 36 students. Model: 4 4 4 4 4 4 4 4 = 32 4 4 4 4 4 4 4 4 4 = 36

8. Model: 4 4 4 4 4 4 4 4 = 32 4 4 4 4 4 4 4 4 4 = 36 This 4 is what fraction of the original model? 1818 increase Percent change? 12.5%

9. Model: 4 4 4 4 4 4 4 4 = 32 4 4 4 4 4 4 4 4 4 = 36 What is the fraction that represents the change 9898 (new)___ (original) What is the percent that represents the change? 112.5%

10. At East Elementary, 300 students participated in Science Fair in 2011. In 2012 400 students participated. Model: 100 100 100 = 300 100 100 100 100 = 400

11. Model: This 100 is what fraction of the original model? 1313 increase Percent change? 33% 100 100 100 = 300 100 100 100 100 = 400

12. Model: What is the fraction that represents the change 4343 (new)___ (original) What is the percent that represents the change? 133% 100 100 100 = 300 100 100 100 100 = 400

13. Jason used to spend 90 minutes a day on the phone. He now spends 60 minutes a day. Model: 30 30 30 = 90 30 30 = 60

14. Model: This 30 is what fraction of the original model? 1313 decrease Percent change? 33% 30 30 30 = 90 30 30 = 60

15. Model: What is the fraction that represents the change 2323 (new)___ (original) What is the percent that represents the change? 67% 30 30 30 = 90 30 30 = 60