Section 1.4 Rounding and Estimating 31 Skill Practice 9. The two countries with the largest areas of rainforest are Brazil and the Democratic Republic of Congo. The rainforest areas are 4,776,980 square kilometers (km2) and 1,336,100 km2, respectively. Round the values to the nearest hundred-thousand. Estimate the total area of rainforest for these two countries. Skill Practice 10. In a recent year, there were 135,073,000 persons over the age of 16 employed in the United States. During the same year, there were 6,742,000 persons over the age of 16 who were unemployed. Approximate each value to the nearest million. Use these values to approximate how many more people were employed than unemployed. 3. Using Estimation in Applications Estimating a Sum in an Application Example 7 A driver for a delivery service must drive from Chicago, Illinois, to Dallas, Texas, and make several stops on the way. The driver follows the route given on the map. Estimate the total mileage by rounding each distance to the nearest hundred miles. Solution: Kansas City Oklahoma City 205 mi 354 mi Dallas 541 mi 418 mi Little Rock 541 rounds to 500 418 rounds to 400 354 rounds to 400 205 rounds to 200 The driver traveled approximately 1500 mi. 1500 Chicago Estimating a Difference in an Application Example 8 In a recent year, the U.S. Census Bureau reported that the number of males over the age of 18 was 100,994,367. The same year, the number of females over 18 was 108,133,727. Round each value to the nearest million. Estimate how many more females over 18 there were than males over 18. Solution: The number of males was approximately 101,000,000. The number of females was approximately 108,000,000. 108,000,000 101,000,000 7,000,000 There were approximately 7 million more women over age 18 in the United States than men. Answers 9. 6,100,000 km2 10. 128,000,000
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