Answer :

First convert both fractions into the least common denominator, so 3/4 can be multiplied by 3/3 (another way of writing 1) to get 9/12. Then, just subtract 9/12 from 11/12 and the answer is 2/12 or 1/6 in simplest form.
The answer for 11/12-3/4 is 1/6