Basic math formulasFind here a comprehensive list of basic math formulas commonly used when doing basic math computation Let a_{1},a_{2},a_{3},......,a_{n} be a set of numbers, average = (a_{1} + a_{2} + a_{3},+......+ a_{n})/n Fractions formulas: Converting a mixed number to an improper fraction: Converting an improper fraction to a mixed number: Formula for a proportion: In a proportion, the product of the extremes (ad) equal the product of the means(bc), Thus, ad = bc Percent: Percent to fraction: x% = x/100 Percentage formula: Rate/100 = Percentage/base Rate: The percent. Base: The amount you are taking the percent of. Percentage: The answer obtained by multiplying the base by the rate Consumer math formulas: Discount = list price × discount rate Sale price = list price − discount Discount rate = discount ÷ list price Sales tax = price of item × tax rate Interest = principal × rate of interest × time Tips = cost of meals × tip rate Commission = cost of service × commission rate Geometry formulas: Perimeter: Perimeter of a square: s + s + s + s s:length of one side Perimeter of a rectangle: l + w + l + w l: length w: width Perimeter of a triangle: a + b + c a, b, and c: lengths of the 3 sides Area: Area of a square: s × s s: length of one side Area of a rectangle: l × w l: length w: width Area of a triangle: (b × h)/2 b: length of base h: length of height Area of a trapezoid: (b_{1} + b_{2}) × h/2 b_{1} and b_{2}: parallel sides or the bases h: length of height volume: Volume of a cube: s × s × s s: length of one side Volume of a box: l × w × h l: length w: width h: height Volume of a sphere: (4/3) × pi × r^{3} pi: 3.14 r: radius of sphere Volume of a triangular prism: area of triangle × Height = (1/2 base × height) × Height base: length of the base of the triangle height: height of the triangle Height: height of the triangular prism Volume of a cylinder:pi × r^{2} × Height pi: 3.14 r: radius of the circle of the base Height: height of the cylinder Have any questions about the basic math formulas? Send me an email here and ask me any questions you want about these basic math formulas Related topics: Basic math test Basic math worksheets Special factoring formulas Special math constants 




