Home / Guides

Math Guides

Short, practical explanations for the notation and formulas used by the calculators on this site.

Degrees vs. Radians

Understand angle units and when to use degrees, radians, or gradians.

Learn how scientific notation works and how to enter it into a calculator.

Learn how to add, subtract, multiply, divide, and simplify fractions.

Learn percentage formulas for changes, discounts, increases, and proportions.