Answer: 7
 ---
 12
Explanation:
1/3 and 1/4 have to have the same denominator to be added. 
You have to find a number to multiply by. For 1/3 it is 4.
 1 4 4
--- x --- = ---
 3 4 12
Now for 1/4. For that it is 3.
 1 3 3
--- x --- = ---
 4 3 12
Now you may add both of the fractions. *DENOMINATORS YOU ADD ACROSS!!! << REMEMBER
 4 3 7
 --- + --- = ---
 12 12 12
7/12 is the answer, or as a decimal (rounded) is 1.7