Section 1.3 Subtraction of Whole Numbers 27 Solving an Application Problem Example 8 A criminal justice student did a study of the number of robberies that occurred in the United State over a period of several years.The bar graph shows the results for five selected years. 800,000 442,000 a. Find the increase in the number of reported robberies from year 4 to year 5. b. Find the decrease in the number of reported robberies from year 1 to year 2. Solution: For the purpose of finding an amount of increase or decrease, we will subtract the smaller number from the larger number. a. Because the number of robberies went up from year 4 to year 5, there was an increase. To find the amount of the increase, we subtract the smaller number from the larger number. 4 4 2, 0 0 0 4 0 1, 0 0 0 4 1, 0 0 0 From year 4 to year 5, there was an increase of 41,000 reported robberies in the United States. b. Because the number of robberies went down from year 1 to year 2, there was a decrease. To find the amount of the decrease, we subtract the smaller number from the larger number. 6 2 6 7 12 , 0 0 0 5 3 6, 0 0 0 1 3 6, 0 0 0 From year 1 to year 2 there was a decrease of 136,000 reported robberies in the United States. Answers 13. a. decreased b. 128,000 robberies Number of Robberies by Year Number of Robberies 700,000 600,000 500,000 400,000 300,000 200,000 100,000 0 1 2 3 4 5 Year 672,000 536,000 408,000 401,000 Source: Federal Bureau of Investigation Skill Practice Refer to the graph for Example 8. 13. a. Has the number of robberies increased or decreased between year 2 and year 3? b. Determine the amount of increase or decrease.
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