First you convert both fractions to a common denominator, usually found by multiplying the denominators you have, i.e., 3*4=12. So let's convert to /12:
2/3 = 8/12 (times 4)
1/4 = 3/12 (times 3)
Now you can add them:
8/12 + 3/12 = 11/12
This cannot be simplified, so this is your answer.
