A number r is called a rational number, if it can be written in the form p/q, where p and q are integers and q ≠ 0.
If r is rational and s is irrational, then r + s and r – s are irrational numbers, and rs and r/s are irrational numbers, r ≠ 0.
Rational numbers are any real numbers that can be expressed as a fraction, where both the numerator and denominator are integers.
Irrational numbers are any numbers that cannot be written as a fraction. Irrational numbers can also be expressed as decimals that go on indefinitely, without repetition or pattern.