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6-3

6-3. Percent of a Number. Course 2. Warm Up. Problem of the Day. Lesson Presentation. 6-3. Percent of a Number. Course 2. Warm Up Multiply. 1. 0.05  20 2. 0.32  15 3. 0.06  25 4. 0.75  18 5. 0.34  76. 1. 4.8. 1.5. 13.5. 25.84. 6-3. Percent of a Number.

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6-3

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  1. 6-3 Percent of a Number Course 2 Warm Up Problem of the Day Lesson Presentation

  2. 6-3 Percent of a Number Course 2 Warm Up Multiply. 1.0.05  20 2. 0.32  15 3. 0.06  25 4. 0.75  18 5. 0.34  76 1 4.8 1.5 13.5 25.84

  3. 6-3 Percent of a Number Course 2 Problem of the Day In a group of 60 triangular and square tiles, 25% are red, and 75% are blue. The ratio of triangles to squares is 1:2. Seventy percent of the squares are blue. Find the number of each kind of tile (red or blue squares or triangles). 3 red triangles, 17 blue triangles, 12 red squares, 28 blue squares

  4. 6-3 Percent of a Number Course 2 Learn to find the percent of a number.

  5. 6-3 Percent of a Number Part n Part 67 = Whole Whole 90 100 Course 2 The human body is made up mostly of water. In fact, about 67% of a person’s total (100%) body weight is water. If Cameron weighs 90 pounds, about how much of his weight is water? Recall that a percent is a part of 100. Since you want to know the part of Cameron’s body that is water, you can set up and solve a proportion to find the answer.

  6. 6-3 Percent of a Number Course 2 Additional Example 1A: Using Proportions to Find Percents of Numbers Find the percent of each number. A. 30% of 50 30 100 n 50 = Write a proportion. 30 · 50 = 100 · n Set the cross products equal. 1,500 = 100n Multiply. 1,500 100n Divide each side by 100 to isolate the variable. = 100 100 15 = n 30% of 50 is 15.

  7. 6-3 Percent of a Number Helpful Hint When solving a problem with a percent greater than 100%, the part will be greater than the whole. Course 2

  8. 6-3 Percent of a Number Course 2 Additional Example 1B: Using Proportions to Find Percents of Numbers Find the percent of each number. B. 200% of 24 200 100 n 24 = Write a proportion. 200 · 24 = 100 · n Set the cross products equal. 4,800 = 100n Multiply. 4,800 Divide each side by 100 to isolate the variable. 100n = 100 100 48 = n 200% of 24 is 48.

  9. 6-3 Percent of a Number Course 2 Try This: Example 1A Find the percent of each number. A. 40% of 40 40 100 n 40 = Write a proportion. 40 · 40 = 100 · n Set the cross products equal. 1,600 = 100n Multiply. 1,600 100n Divide each side by 100 to isolate the variable. = 100 100 16 = n 40% of 40 is 16.

  10. 6-3 Percent of a Number Course 2 Try This: Example 1B Find the percent of each number. B. 150% of 64 150 100 n 64 = Write a proportion. 150 · 64 = 100 · n Set the cross products equal. 9,600 = 100n Multiply. 9,600 Divide each side by 100 to isolate the variable. 100n = 100 100 96 = n 150% of 64 is 96.

  11. 6-3 Percent of a Number Helpful Hint When you are solving problems with percents, of usually means “times.” Course 2 In addition to using proportions, you can find the percent of a number by using decimal equivalents.

  12. 6-3 Percent of a Number Course 2 Additional Example 2A: Using Decimal Equivalents to Find Percents of Numbers Find the percent of the number. Estimate to check whether your answer is reasonable. A. 9% of 80 Write the percent as a decimal and multiply. 9% of 80 = 0.09 · 80 = 7.2 Estimate 10% · 80 = 8, so 9% of 80 is less than 8. Thus 7.2 is a reasonable answer.

  13. 6-3 Percent of a Number Course 2 Additional Example 2B: Using Decimal Equivalents to Find Percents of Numbers Find the percent of the number. Estimate to check whether your answer is reasonable. B. 3% of 12 3% of 12 = 0.03 · 12 Write the percent as a decimal and multiply. = 0.36 Estimate 5% · 12 = 0.6, so 3% of 12 is a little less than 0.6. Thus 0.36 is a reasonable answer.

  14. 6-3 Percent of a Number Course 2 Insert Lesson Title Here Try This: Example 2A Find the percent of the number. Estimate to check whether your answer is reasonable. A. 21% of 50 21% of 50 = 0.21 · 50 Write the percent as a decimal and multiply. = 10.5 Estimate 20% · 50 = 10, so 21% of 50 is a little more than 10. Thus 10.5 is a reasonable answer.

  15. 6-3 Percent of a Number Course 2 Try This: Example 2B Find the percent of the number. Estimate to check whether your answer is reasonable. B. 6% of 18 6% of 18 = 0.06 · 18 Write the percent as a decimal and multiply. = 1.08 Estimate 5% · 20 = 1, so 6% of 18 is close to 1. Thus 1.08 is a reasonable answer.

  16. 6-3 Percent of a Number Course 2 Additional Example 3: Geography Application The estimated world population in 2001 was 6,157 million. About 40% of the people were 19 or younger. What was the approximate number of people 19 or younger, to the nearest million? Find 40% of 6,157 million 0.40 · 6,157 Write the percent as a decimal. Multiply. 2,462.8 The number of people 19 or younger was about 2,463 million.

  17. 6-3 Percent of a Number Course 2 Try This: Example 3 The estimated world population in 2001 was 6,157 million. About 60% of the people were above 19 years of age. What was the approximate number of people 19 or older, to the nearest million? Find 60% of 6,157 million. 0.60 · 6,157 Write the percent as a decimal. 3,694.2 Multiply. The number of people 19 or older was about 3,694 million.

  18. 6-3 Percent of a Number Course 2 Insert Lesson Title Here Lesson Quiz Find the percent of each number. 1. 25% of 8 2. 40% of 110 3. 150% of 96 4. 0.3% of 120 5. Whitmer Middle School has 850 students. If 42% of the students bought lunch on Monday, how many student bought lunch on Monday? 2 44 144 0.36 357

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