How do you simplify \frac{40}{-25}?

$- \frac{8}{5}$
$\frac{40}{- 25} = \frac{- {2}^{3} \cdot 5}{5} ^ 2 = \frac{- {2}^{3} \cdot \cancel{5}}{5 \cdot \cancel{5}} = - \frac{8}{5}$