Answer
$\frac{5}{4}$
Work Step by Step
In order to add or subtract fractions, we need common denominators. Because 3/8 and 7/8 already have the same denominator, 8, we can add the numerators together:
$ \frac{3}{8} + \frac{7}{8} = \frac{10}{8}=\frac{5}{4}$
