1. Algebra 2.8 Percents

2. Learning Targets Language Goal Students will be able to verbally express numbers written as percents. Math Goal Students will be able to solve problems involving percents. Essential Question Where do you use percents in the world around you?

3. Warm-up

4. Homework Check

6. Vocabulary Solution of an equation Contradiction Literal Equation Rate Conversion Factor Cross products

7. Vocabulary Equation Identity Formula Ratio Unit Rate Proportion

8. Vocabulary Percent: A ratio that compares a number to 100.

9. Changing Percents to Fractions

10. Changing Percents to Decimals Move the decimal point two spaces to the left. 25% =.25

11. Here are common Percents!

12. Example 1: Finding the Part

14. Method 2: x = (% written as a decimal)(#) A. Find 105% of 72 B. Find 4% of 36 C. Find 300% of 3

15. Example 2: Finding the percent

16. Method 2: x = (% written as a decimal)(#) A. What percent of 35 is 7? B. 27 is what percent of 9?

17. Example 3: Finding the Whole

18. Method 2: x = (% written as a decimal)(#) A. 120% of what number is 90? B. 48 is 15% of what number?

19. Example 4: Career Application A. Jewelers use the karat system to determine the amount of pure gold in jewelry. Pure gold is 24 karat, meaning the item is 100% gold. A 14-karat god ring contains 14 parts gold and 10 parts other metal. What percent of the ring is gold? Round your answer to the nearest percent.

20. Example 4: Career Application B. Use the information before to find the number of karats in a bracelet that is 42% gold. Round your answer to the nearest whole number.

21. Shopping Examples The regular price of an ipod is $209. If you have a student id you can save 10%. 1.How much money do you save? 2.What is the final price of the ipod? What is 10% of $209?

22. Restaurant Example: You are going to eat at your favorite restaurant with a group of your friends. You get your bill back and your bill is $8.45. You want to leave a 18% tip. What is the final cost of your bill including tip?

23. Shopping Example: The sale price of a pack of socks is $6 off after a 10% discount. You want to know the original price? ▫$6 is 10% of what number?

24. Extension Proportion Review

25. Station Time

26. Lesson Quiz