1. Define the terms. A percentage is a number or ratio that represents a part of a whole. It is expressed as a fraction of 100, and the symbol for percentage is "%".
2. Determine the value you want to express as a percentage. This is the "part" of the whole.
3. Determine the total value. This is the "whole" that the part is a part of.
4. Divide the value you want to express as a percentage by the total value.
5. Multiply the result by 100.

Here is an example:

• You want to calculate the percentage of students in your class who are female.
• The value you want to express as a percentage is the number of female students in your class.
• The total value is the total number of students in your class.
• Let's say there are 10 female students in your class of 20 students.
• To calculate the percentage of female students in your class, you would divide 10 by 20 and then multiply the result by 100.
• 10 / 20 = 0.5
• 0.5 * 100 = 50
• Therefore, 50% of the students in your class are female.