Percents are calculated by dividing a number by 100. Percentages are written as a fraction or a decimal. When referring to percents, it is similar to saying "per 100."
Fifty percent refers to 50 per 100. It means that 50 percent or one-half of something is being referenced. One hundred percent refers to all of something.
An example of calculating percent is seen through finding 25 percent of the number 80. Twenty-five percent is converted to a number by dividing 25 by 100, written as a fraction as 25/100 or as 0.25 as a decimal. This is then multiplied by 80, providing an end result of 20.