Method 1: Use long division to calculate 9÷15, then multiply the quotient by 100. 9÷15 = 0.6 0.6×100 = 60 So, 9 is 60% of 15. Method 2: Change 9/15 so the denominator is 100.The numerator is the percentage. 9/15 = 3/5 = 60/100 9 is 60% of 100.D.W. · 7 years ago.eport Abuse. Method 1: Use long division to calculate 9÷15, then multiply the quotient by 100. 9÷15 = 0.6 0.6×100 = 60 So, 9 is 60% of 15. Method 2: Change 9/15 so the denominator is 100. The numerator is the percentage.