20 Chapter 1 Whole Numbers In Examples 11 and 12, we use addition and subtraction of whole numbers to solve application problems. Germany 10 13 7 USA 9 15 13 Canada 14 7 5 Solving an Application Problem Example 11 Example 12 Gold Silver Bronze A criminal justice student did a study of the number of robberies that occurred in the United States over a period of several years. The graph shows his results for five selected years. 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. Number of Robberies for Selected Years Number of Reported Robberies 408,000 401,000 Year 800,000 600,000 400,000 200,000 0 672,000 536,000 442,000 1 2 3 4 5 Source: Federal Bureau of Investigation Answers 19. a. 25 b. 37 20. a. decreased b. 94,000 robberies 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 increase, 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 Solving an Application Problem Involving a Table The table gives the number of gold, silver, and bronze medals won in the 2010 Winter Olympics for selected countries. a. Find the total number of medals won by Canada. b. Determine the total number of silver medals won by these three countries. Solution: a. The number of medals won by Canada appears in the last row of the table. The word “total” implies addition. 14 7 5 26 Canada won 26 medals. b. The number of silver medals is given in the middle column. The total is 13 15 7 35 There were 35 silver medals won by these countries. Skill Practice Refer to the table in Example 11. 19. a. Find the total number of bronze medals won. b. Find the number of medals won by the United States. Skill Practice Refer to the graph for Example 12. 20. a. Has the number of robberies increased or decreased from Year 2 to Year 5? b. Determine the amount of increase or decrease. From Year 4 to Year 5, there was an increase of 41,000 reported robberies in the United States.
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