Money
30 + 70 = 100
30p + 70p = 100p or £1
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The set of Natural Numbers is the set of 'counting numbers' {1,2,3,4,....}. All of them are also real numbers.
-3 is a real, rational, whole integer. But then, -- All integers are real rational whole numbers. -- All whole numbers are real rational integers. -- All rational numbers are real. -- All counting numbers are real, rational, whole integers.
Natural numbers or Counting numbers Integers Rational numbers Irrational numbers
Natural (or counting) numbers Integers Rationals Irrationals Transcendentals
Every counting number, and the negative of it, are real, rational integers.