There are six common sets of numbers.
Natural (Counting) Numbers:
Whole Numbers: Natural Numbers and
Rational Numbers: Integers, Fractions, and Terminating or Repeating Decimals
Irrational Numbers: Non Terminating or Non Repeating Decimals
Real Numbers: Rational Numbers and Irrational Numbers
Determine which sets the number fits into.
Natural Numbers, Whole Numbers, Integers, Rational Numbers, Real Numbers
Determine the Type of Number 18