Basic Maths Formula
BASIC MATHS FORMULA Average formula: 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 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 o