Finding a Percent of a Number COURSE 2 LESSON 6-4 Finding a Percent of a Number Find each answer. a. 15% of 40 Method 1   Write 15% as a fraction and multiply. Write the percent as a fraction in simplest form. 15% = = 15 100 3 20 3 20 • 40 = 6 Multiply. Method 2   Write 15% as a decimal and multiply. Write the percent as a decimal. 15% = 0.15 0.15 • 40 = 6 Multiply. 6-4

Finding a Percent of a Number COURSE 2 LESSON 6-4 Finding a Percent of a Number (continued) b. 80% of 460 Method 1   Write 80% as a fraction and multiply. Write the percent as a fraction in simplest form. 80% = = 80 100 4 5 4 5 • 460 = 368 Multiply. Method 2   Write 80% as a decimal and multiply. Write the percent as a decimal. 80% = 0.80 0.80 • 460 = 368 Multiply. 6-4

Finding a Percent of a Number COURSE 2 LESSON 6-4 Finding a Percent of a Number There are 25 students in a class. 20% of them have green eyes. How many have green eyes? Estimate  20% of 25 • 25 or about 6 1 4 Change the percent to a decimal.    20% = 0.2 0.2 • 25 = 5 Multiply. Five students in the class have green eyes. Check for Reasonableness  The answer 5 is close to the estimate 6. The answer is reasonable. 6-4