Percentage Difference
www.mathsisfun.com › percentage-differenceDifference = 6 − 9 = −3. But in this case we ignore the minus sign, so we say the difference is simply 3. (We could have done the calculation as 9 − 6 = 3 anyway, as Sam and Alex are equally important!) The Average is (6+9)/2 = 7.5. Percentage Difference = (3/7.5) x 100% = 40%.