Algebra 1: Common Core (15th Edition)

$\frac{4}{8}$
In order to add or subtract fractions, we need common denominators. Because 7/8 and 3/8 already have the same denominator, 8, we can subtract the numerators: $\frac{7}{8} - \frac{3}{8} = \frac{4}{8}$=$\frac{1}{2}$