I'll first convert to improper fractions...rule a b/c=(ac+b)/c
31/6-8/3
adding/subtracting fractions requires a common denominator...
31/6-(8/3)(2/2)
31/6-16/6
(31-16)/6
15/6 now convert back to mixed number....
(12+3)/6
2 3/6 and simplify fractional part...
2 1/2
