Convert the mixed numbers into improper fractions. 6 1/2= 13/2 3 2/6= 20/6 Now, find a common denominator. In this case, the common denominator is 6. 13/2*3/3=39/6 20/6 stays as 20/6 Subtract both fractions. 39/6-20/6=19/6 19/6 can be written as 3 1/6. Tara has 3 1/6 dozen of cookies remaining.
