Real Numbers Natural Numbers Whole Numbers Integers Rational Numbers Irrational Numbers Real Numbers -2 -1 0 1 2 3 Real Numbers Rational Numbers Irrational Numbers -2 -1 0 1 2 3 Integers -2 -1 0 1 2 3 Whole Numbers Any number you can write in the form In decimal form it either terminates or repeats Natural Numbers Cannot be expressed in the form Decimal representations are non-repeating or non-terminating. Together, rational numbers and irrational numbers form this set.