We will multiply 3/20 by 5/5 because 20•5=100 and percents are fractions over a hundred. But, since we multiplied 5 by 20, we need to do the same to the numerator, 3. 3•5=15. Our new fraction is 15/100. When we have a numerator, in this case 15, over the denominator 100, our numerator would be the percent. So, 3/20 as a percent is 15%