How to find rational numbers between two rational number?

Hence, 5 rational numbers between 2/5 i.e 0.4 and 3/5 i.e. 0.6 will be all rational numbers between 0.4

and 0.6 i.e. 0.41 , 0.42, 0.43, 0.44, 0.45 …

These can be written in the form of fraction as 41/100, 42/100, 43/100, 44/100, 45/100 …etc