Find three rational numbers lying between 0 and 0.1. Find twenty rational numbers between 0  and 0.1. Give a method to determine any number of rational numbers between 0 and 0.1.

The three rational numbers lying between 0 and 0.1 are 0.01, 0.05, 0.09. 
The twenty rational numbers between 0 and 0.1 are 0.001, 0.002, 0.003, 0.004, … 0.011, 0.012, … 0.099.
To determine any number of rational numbers between 0 and 0.1 insert the square root of its product.
i.e. The rational numbers between a and b is