text: what is the formula to change percentages to fractions?   the word percent means per 100. so for example, 17% = 17/100. what if the percentage has a decimal in it? it still works the same way. for example, 17.5% = 17.5/100. we can multiply top and bottom by 10 to get 175/1000.  read more here --> http://www.mathsisfun.com/converting-percents-fractions.html