Evaluate $\frac{3}{8}\times\frac{5}{7}$38×57.

Evaluate $\frac{6}{7}\times\frac{3}{11}$67×311.

Evaluate $\frac{4}{11}\times\frac{1}{10}$411×110.

Evaluate $\frac{7}{10}\times\frac{2}{9}$710×29.

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