Question

Multiply the reciprocal of $\frac{7}{8}$ by the reciprocal of $\frac{-2}{21}$

Answer 1

$\because$ Reciprocal of $\frac{7}{8}$ is $\frac{8}{7}$

Reciprocal of $\frac{-2}{21}$ is $\frac{-21}{2}$

$\therefore$ Reciprocal of $\frac{7}{8}\times$ Reciprocal of $\frac{-2}{21}$

$=\frac{8}{7}\times \frac{-21}{2}$

$=\frac{4\times -3}{1\times 1}=-12$