we are given with two mixed fractions 72 1/4 and 66 3/8 and is asked to determine the difference between them. first step is to transform these into improper fractions:72 1/4 = 289/4 ; 66 3/8 = 531/8 then transform 289/4 into a fraction with a denominator of 8 which is 578 /8. the difference between the two is 47/8.