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Do Now Multiply Course Percent of a Number Hwk: 54

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Learn to find the percent of a number. Course Percent of a Number M7A2.a Given a problem, define a variable, write an equation, solve the equation, and interpret the solution; M7A2.b Use the addition and multiplication properties of equality to solve one- and two-step linear equations;

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Course Percent of a Number The human body is made up mostly of water. In fact, about 67% of a persons total (100%) body weight is water. If Cameron weighs 90 pounds, about how much of his weight is water? Part 67 = nPart Whole

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Find the percent of each number. Additional Example 1A: Using Proportions to Find Percents of Numbers Course Percent of a Number 30% of = n · 50 = 100 · n 1,500 = 100n 1, = 100n 15 = n 30% of 50 is 15.

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

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Additional Example 1B: Using Proportions to Find Percents of Numbers Course Percent of a Number Find the percent of each number. 200% of = n · 24 = 100 · n 4,800 = 100n 4, = 100n 48 = n 200% of 24 is 48.

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Find the percent of each number. Check It Out: Example 1A Course Percent of a Number 40% of = n · 40 = 100 · n 1,600 = 100n 1, = 100n 16 = n 40% of 40 is 16.

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Check It Out: Example 1B Course Percent of a Number Find the percent of each number. 150% of = n · 64 = 100 · n 9,600 = 100n 9, = 100n 96 = n 150% of 64 is 96.

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Find the percent of the number. Check whether your answer is reasonable. Additional Example 2A: Using Decimal Equivalents to Find Percents of Numbers Course Percent of a Number 9% of 80 9% of 80 = 0.09 · 80 = 7.2

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Additional Example 2B: Using Decimal Equivalents to Find Percents of Numbers Course Percent of a Number Find the percent of the number. 3% of 12 3% of 12 = 0.03 · 12 = 0.36

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Find the percent of the number. Check whether your answer is reasonable. Check It Out: Example 2A Course Percent of a Number 21% of 40 21% of 40 = 0.21 · 40 = 8.4

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Check It Out: Example 2B Course Percent of a Number Find the percent of the number. 6% of 18 6% of 18 = 0.06 · 18 = 1.08

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Additional Example 3: Geography Application Course Percent of a Number 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 · 6,157 2,462.8

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Check It Out: Example 3 Course Percent of a Number 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 · 6,157 3,694.2 The number of people 19 or older was about 3,694 million.

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You Try Find the percent of each number % of % of 110 Find the percent of each number. Check whether your answer is reasonable % of % of Whitmer Middle School has 850 students. If 42% of the students bought lunch on Monday, how many student bought lunch on Monday? 44 2 Insert Lesson Title Here Course Percent of a Number 357

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