Question

What is a rational number??!!

Answer 1

A rational number is a number that can be put over another number. So basically, it has to be p/q. What are some examples of rational and irrational numbers?
0.001 can be put over 1000.
However, 
√2 can not be put over anything. Hence, it's irrational. 
Again!
0.5 = 1/2, so rational
0.55 = 55/100, so rational!
Hope this helps!

Answer 2

In mathematics, a rational number is any number that can be expressed as the quotient or fraction x/y of two integers, a numerator x, and a non zero denominator y. Since y may be equal to 1, every integer is a rational number.
A real number that is not rational is called irrational.  
Hope this helps!