The set of natural numbers or counting numbers N is a subset of the set of real numbers R.
N = {1, 2, 3, ...)
R = {..., -2, -1, -0.5, 0, 1, √2, 2, 3, π, ...}
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a rational number is different from a natural number because a rational number can be expressed as a fraction and natural numbers are just countinq numbers =D
The difference between the greatest and least number is the range.
The difference between each number in an arithmetic series
18
The difference between anything and itself is zero.