Can you think of other way(s) to find a rational number between any two rational numbers? [Page No. 53]

Yes, there are methods:

(1) Taking average:

If $a$ and $b$ are two rational numbers, then

$$\frac{(a+b)}{2} \text{ lies between them.}$$

(2) By making common denominator:

Convert both numbers to same denominator and choose a number in between.

(3) By decimal expansion:

Convert into decimals and pick numbers in between.