How many rational numbers have an absolute value less than $3$?

Add $\frac{4}{-5} \& \frac{2}{3}$.

Subtract $\frac{-6}{7}$ from the sum of $1 \& \frac{-2}{7}$.

Write the additive inverse of $\frac{3}{8}$ and multiply it with the multiplicative inverse of $\frac{-9}{4}$.

Simplify:

$\frac{-6}{16}\times \frac{8}{9}$

Find the value of the following:

$\left|\frac{-11}{5}+\frac{3}{-20}\right|$

Find five rational numbers between $\frac{3}{5}\&\frac{5}{6}$.

If $\frac{p}{q}$ is any rational number where $q\ne 0,$ then prove that $\left(\frac{p}{q}\right)\times {\left(\frac{p}{q}\right)}^{-1}=1$.

Divide $\left(\frac{-3}{14}\right) by \frac{9}{7}$.