Carlene has 2 8/12 yards of ribbon left over.
First) You write the problem.Then find a common denominator for both fractions (common denominator is 12 since 6 x 2 = 12 and 2 x 6= 12)
Second)You write equivalent fractions that end with a denominator of 12. (8 2/12 and 5 6/12)
Third)You need to rename the mixed numbers since you cannot take away 6/12 from 2/12. ( Rename the numbers as 7 14/12 and keep the 5 6/12 the same)
Lastly, you subtract the whole numbers, and the numerators and get your answer of 2 8/12.
Hope this helps!