Every rational number can be expressed as a _____ decimal.

Find the product:

$\frac{2}{3}\times \frac{4}{5}$

Find the product:

$\frac{1}{5}\times \frac{1}{5}\times \frac{1}{2}$

Find the product:

$\frac{5}{6}\times \frac{2}{5}$

Find the product:

$\frac{4}{5}\times 6$

Find the product:

$\frac{1}{7}\times \frac{7}{1}$

Find the quotient:

$\frac{15}{19}÷\frac{5}{3}$