Answer: 7/8.
Step-by-step explanation: When you add fractions, make sure they have the same denominator. In this case, that has already been done, so the next step is to add the numerators and not worry about the denominators. The denominators will stay the same when you add them, so the only thing that changes when you add the fractions is the numerators.
3/8 + 4/8 = 7/8.
Hope this helps!