operations On Rational Numbers. Rational Numbers are any real numbers that can be expressed as a simple fraction or ratio. Thus, a rational number can be defined as any number which can be written in the form where p and q are any two integers and q not equal to zero (q ≠ 0).this number are also found in <a href="http://all4webs.com/poonammark/home.htm?28851=47794">all Credit and Debit card</a>