The three rational numbers lying between 0 and 0.1 are 001,005,009. 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 √a×b .