Find a rational number between $-3$ and $1$.

Given: 

Given rational numbers are $-3$ and $1$.

To do:  

We have to find a rational number between $-3$ and $1$.

Solution:

We know that,

A number between two rational numbers $a, b=\frac{a+b}{2}$

Therefore,

Rational number between $-3$ and $1=\frac{-3+1}{2}$

$=\frac{-2}{2}$

$=-1$