1. Course 1 7-9 Percent Problems 7-9 Percent Problems Course 1 Warm Up Warm Up Lesson Presentation Lesson Presentation Problem of the Day Problem of the Day

2. Course 1 7-9 Percent Problems Warm Up Write each decimal as a percent and fraction. 1. 0.38 2. 0.06 3. 0.2 38%, 6%, 20%, 19 50 __ 3 50 __ 1 5

3. Course 1 7-9 Percent Problems Problem of the Day Lucky Jim won $16,000,000 in a lottery. Every year for 10 years he spent 50% of what was left. How much did Lucky Jim have after 10 years? $15,625

4. Course 1 7-9 Percent Problems Learn to find the missing value in a percent problem.

5. Course 1 7-9 Percent Problems IS = % X OF OR IS = %(OF) EX. 45% of 420, 45 replaces the percent sign and 420 replaces “of.” Change percent to a decimal IS = %(OF) n =.45(420) n = 189

6. Course 1 7-9 Percent Problems Additional Example 1 Continued

7. Course 1 7-9 Percent Problems Check It Out: Example 1 There are 480 students in Tisha’s school. If 70% of the students participate in the fundraising program, how many students participate in the fundraising program?

8. Course 1 7-9 Percent Problems Additional Example 2: Application Johan is 25% of the way through his exercises. If he has exercised for 20 minutes so far, how much longer does he have to work out?

9. Course 1 7-9 Percent Problems Check It Out: Example 2 Phil is 30% of the way through his homework. If he has worked for 15 minutes so far, how much longer does he have to work?

10. Course 1 7-9 Percent Problems Instead of using proportions, you can also multiply to find a percent of a number.

11. Course 1 7-9 Percent Problems Additional Example 3: Multiplying to Find a Percent of a Number 36% = 0.36 0.36 50 Write the percent as a decimal. Multiply using the decimal. 18 So 18 is 36% of 50. Find 36% of 50. 0 5 10 15 20 25 30 35 40 45 50 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Check Use a model to check the answer.

12. Course 1 7-9 Percent Problems Check It Out: Example 3 20% = 0.20 0.20 70 Write the percent as a decimal. Multiply using the decimal. 14 So 14 is 20% of 70. Find 20% of 70. 0 7 14 21 28 35 42 49 56 63 70 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Check Use a model to check the answer.

13. Course 1 7-9 Percent Problems Lesson Quiz 1. Find 28% of 310. 2. Find 70% of 542. 3. Martha is taking a 100-question test. She has completed 60% of the test in 45 minutes. How much longer will it take her to finish the test? 4. Crystal has a collection of 72 pennies. If 25% of them are Canadian, how many Canadian pennies does she have? 379.4 86.8 30 min 18