Question

By what number should we multiply $(-8{)}^{-1}$ to obtain ${12}^{-1}$?

Answer 1

Let the number be x

${(-8)}^{-1}\times x={\left(12\right)}^{-1}$

$\frac{-1}{8}\times x=\frac{1}{12}$

$x=\frac{-8}{12}=\frac{-2}{3}$