Hi
Would you tell me about rational number

These sites may help you out!

Rational number - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Rational_number)

Math Forum: Ask Dr. Math FAQ: Integers, Rational Numbers, Irrational Numbers (http://mathforum.org/dr.math/faq/faq.integers.html)

2.2 Rational Numbers (http://www.dgp.toronto.edu/people/mooncake/thesis/node17.html)

Rational Numbers (http://www.mathsisfun.com/rational-numbers.html)