8.1 Percentages

Introduction

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