Free math lessons and math homework help from basic math to algebra, Formula Derivations - (High School +) Derivations of area, perimeter, volume and. Basic Math Formulas. Part of Everyday Math For Dummies Cheat Sheet. If you're looking to find the area or volumes of basic shapes like rectangles, triangles. Multiplication and addition tables, common formulas, square roots, powers and exponents, fractions, decimals, percents, order of operations, and more.