Error Calculation Since the calculation of the density involves the product(division) of some measured numbers, the relative error of the result will the sum of relative error of factors. 3 First find the absolute errors for the lengths and masses, calculate the corresponding relative errors , add the corresponding relative error, with correct multiplicities (if formula has R), for example, then the relative error of volume will have a 2 AR/R term) 4? = sphere/cube Ap = AV = cylinder App = Ap cc+ AVVA = Amm+11AR cc + Ap H = rectangle