First make the fractions into improper fractions. So then it becomes 15/4 divided by 25/12. Next do the KCF method (Keep.change. Flip) Keep 15/4 the same and switch the numbers of 25 and twelve. Then multiply. 15/4 x 12/25= 180/100 Simplify. So 3 3/4 divided by 2 1/12 =9/5 9/5 can also be written as 1 4/5