I'm sorry for been so late.
Rational Numebers: a rational number is any number that can be expressed as the quotient or fraction p/q of two integers, a numerator p and a non-zero denominator q. For example: 1，2，3,-1，-2，-3
Irrational Numbers: an irrational number is a real number that cannot be expressed as a ratio of integers. For example: 1/3, 1/7 , 1/9
Real Numbers: a real number is a value that represents a quantity along a continuous line. For example: all rational and irrational numbers.
Whole Numbers: A member of the set of positive integers and zero. A positive integer. An integer. For example: 142， 20， 1
