Natural numbers are a special kind of Rational numbers. Rational numbers can be expressed as a fraction. (Positive) fractions with the same (nonzero) numerator and denominator are natural numbers, for example 9/9 = 1.
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It is the set of natural numbers.
Natural numbers = Whole numbers are a subset of integers (not intrgers!) which are a subset of rational numbers. Rational numbers and irrational number, together, comprise real numbers.
Yes. The square root of 81 is 9 - a natural number and all natural numbers are rational numbers.
A while number can be expressed as itself over 1, eg 5 = 5/1; and this is one integer over another which is the form of rational numbers, so Whole numbers are rational numbers.
Numbers that include real numbers are natural numbers, whole numbers, integers, rational numbers and irrational numbers.