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Order numbers in scientific notation EXAMPLE 3 SOLUTION STEP 1 Write each number in scientific notation, if necessary. 103,400,000 = 1.034 10 8 80,760,000 = 8.076 10 7 Order 103,400,000, 7.8 10 8, and 80,760,000 from least to greatest.

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Order numbers in scientific notation EXAMPLE 3 STEP 2 Order the numbers. First order the numbers with different powers of 10. Then order the numbers with the same power of 10. Because 10 7 < 10 8, you know that 8.076 10 7 is less than both 1.034 10 8 and 7.8 10 8. Because 1.034 < 7.8, you know that 1.034 10 8 is less than 7.8 10 8. So, 8.076 10 7 < 1.034 10 8 < 7.8 10 8.

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Order numbers in scientific notation EXAMPLE 3 STEP 3 Write the original numbers in order from least to greatest. 80,760,000; 103,400,000; 7.8 10 8

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Compute with numbers in scientific notation EXAMPLE 4 Evaluate the expression. Write your answer in scientific notation. a. (8.5 10 2 )(1.7 10 6 ) (8.5 1.7) (10 2 10 6 )= 14.45 10 8 = (1.445 10 1 ) = 10 8 1.445 (10 1 ) = 10 8 Commutative property and associative property Product of powers property Write 14.45 in scientific notation. Associative property 1.445 10 9 = Product of powers property

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Compute with numbers in scientific notation EXAMPLE 4 b. (1.5 10 3 ) – 2 (10 3 ) – 2 = 1.5 2 (10 6 ) – = 2.25 Power of a product property Power of a power property 103 c. 1.2 10 4 1.6 = 10 3 – 1.2 1.6 10 4 Product rule for fractions (10 7 ) = 0.75 (7.5 10 1 ) – = 10 7 7.5 (10 1 – = 10 7 ) (10 6 ) = 7.5 Quotient of powers property Write 0.75 in scientific notation. Associative property Product of powers property

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GUIDED PRACTICE for Examples 3 and 4 Order 2.7 10 5, 3.401 10 4, and 27,500 from least to greatest. 2. ANSWER 27,500; 3.401 10 4, and 2.7 10 5

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GUIDED PRACTICE for Examples 3 and 4 Evaluate the expression. Write your answer in scientific notation. 3. (1.3 10 5 ) – 2 (10 10 ) – = 1.69 10 2 4. 4.5 10 5 – 1.5 10 7 = 3 5. (1.1 10 7 ) (4.2 10 2 ) 4.62 10 9 =

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Chapter 7 Section 5 Copyright © 2008 Pearson Education, Inc. Publishing as Pearson Addison-Wesley.

Chapter 7 Section 5 Copyright © 2008 Pearson Education, Inc. Publishing as Pearson Addison-Wesley.

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