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Display slide and have students discuss the trends shown in population. Ask students how they can determine the percent increase or decrease in population for a particular city. change in population population in 1990 100 You may want them to use a calculator to find the percent increase and decrease for each city. Ask them why they think the populations are increasing or decreasing. For example, the population of cities in Nevada is booming because of the increase in gambling and the population of some Arizona towns is increasing because retired people are moving to warmer climate.