More Definitions Relating to Numbers
 Rational Numbers can be written as a ratio of one number to another.
 Integers are rational numbers with a denominator of 1.
 Fractions are rational numbers that are written with a numerator and a denominator.
 Irrational Numbers cannot be written as a ratio (e.g. pi and the square root of 2).
 Real Numbers include all the rational and irrational numbers and can be positive, negative or zero.

