We try to convert the first fraction into a form with 12 as its denominator. This may be done by multiplying both the numerator and the denominator by 3, giving 3/12. The operation then becomes,
3/12 + 5/12
We now have the same denominator, all we have to do is do add up the numerators. The answer is,
(3+ 5)/ 12 = 8/12 = 2/3
Thus, the answer is 2/3.