### Quick Answer

Calculating percentages is a key concept in mathematics. Percentage calculations are important in all forms of mathematics including algebra, geometry and calculus. They're also utilized in many sciences such as chemistry, physics and biology.

Know More### Full Answer

### Determine your variables

Determine which numbers are your part and your whole. Your whole number is the number that equals 100 percent. The part is the number that you're trying to find how many percents of the whole number it takes up.

### Divide the part into the whole

Divide the part number variable into the whole number variable to obtain a decimal.

### Multiply by 100

Multiply your decimal by 100 to convert the decimal into a percentage. Add a percent sign.