Answer
$-\frac{3}{5}$
Work Step by Step
Dividing by a fraction is the same as multiplying by the reciprocal of the fraction.
$-\frac{3}{8}\div\frac{5}{8} = -\frac{3}{8}\times\frac{8}{5}$
Multiply the numerators and the denominators like you would for any other fraction:
$-\frac{3}{8}\times\frac{8}{5} = -\frac{24}{40}$.
Simplify to $-\frac{3}{5}$.
