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Percents Practice Makes Perfect!

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In 1999 there were 108,000,000 coffee consumers in the United States. If the US population was 272,690,813 in 1999, what percent of the US population were coffee consumers? Formula: Percent of part/whole=percent 108,000,000/272,690,813= 0.3961 In 1999 39.61% of the US population were coffee consumers.

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In 2009, there were 32,444,000 males and 26,655,000 females in the US that were never married. By what percent were the number of never-married males larger than never-married females? Percent change(difference) formula: (y2-y1)/y1 Y1: never married females Y2: never married males (32,444,000-26,655,000)/26,655,000= 0.2172 The number of never-married males was 21.72% larger than never-married females.

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In 2009, there were 32,444,000 males and 26,655,000 females in the US that were never married. By what percent were the number of never-married females less than never-married males? Percent change(difference) formula: (y2-y1)/y1 Y1: never married males Y2: never married females (26,655,000-32,444,000)/32,444,000= 0.1784 The number of never-married females was 17.84% less than never-married males.

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Percent change Percent larger/smaller By what percent greater/ less? What is the percent increase/decrease? Identify the direction of change (the change is from what value to what value) Y1: the reference/previous value Y2: the new/ different value Formula: (Y2-Y1)/Y1

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