Find the greatest and the least of the following rational numbers: 

$-12,8,-3,12,-8,3,0$

Find the greatest and the least of the following rational numbers: 

$\frac{2}{3},\frac{3}{5},\frac{2}{5},\frac{3}{4},\frac{3}{8}$

Represent the following number on number line.

$\frac{-7}{4}$

Represent the following number on number line.

$0$

Represent the following number on number line.

$-1.8$

Represent the following number on number line.

$\frac{3}{2}$

Represent the following number on number line.

$\frac{-5}{6}$

Represent the following number on number line.

$3.25-4.75+\frac{3}{4}$

Obtain one rational number between $\frac{1}{3}$ and $\frac{1}{2}$