Evaluate $9\times\left(-\frac{4}{5}\right)$9×(−45), giving your answer in simplest form.

Find $-\frac{3}{7}\times\frac{4}{7}$−37×47, giving your answer in simplest form.

Find $-\frac{2}{9}\times\left(-\frac{2}{3}\right)$−29×(−23), giving your answer in simplest form.

Evaluate $-\frac{2}{7}\times\frac{3}{8}$−27×38, giving your answer in simplest form.

Simplify numerical expressions involving integers and rational numbers, with and without the use of technology