# The Real Number System: Rational & Irrational Numbers

What are Rational Numbers? In mathematics, a rational number is any number that can be expressed as a fraction, or the quotient or fraction p/q of two integers, with the denominator q not equal to zero. Basically, numbers that CAN be written as a fraction, or terminating decimals, or predictable fractions like 1/3 Rational numbers can be categorized into Read more about The Real Number System: Rational & Irrational Numbers[…]