8.1 Percentages


Articles you read and newscasts you may watch or listen to often mention the results of surveys and studies in percents. Literally, percent means per one hundred. So 25% (which is read as “twenty-five percent”) means “25 out of one hundred.”

One of the reasons percentages are useful is that you can compare them easily. For example, if a restaurant noted that 42% of customers opted for a meat dish, 35% chose a vegetarian dish, and 23% ordered fish, you can quickly conclude that the meat dish was most popular.

Note: The preferences of the customers in the example above will add up to 100; in this case 42 percent prefix plus of 35 percent prefix plus of 23 percent equals 100 percent.

8.0.1 What to Expect in this Unit

8.1.1 Writing a Percentage as a Fraction or Decimal