A natural number is a number that occurs commonly and obviously in nature as such it is a whole non negative number the set of natural numbers denoted n can be defined in either of two ways. Real numbers include natural numbers whole numbers integers rational numbers and irrational numbers real numbers also include fraction and decimal numbers in summary this is a basic overview of the number classification system as you move to advanced math you will encounter complex numbers. The whole numbers from 1 upwards 1 2 3 and so on or from 0 upwards in some fields of mathematics 0 1 2 3 and so on no negative numbers and no fractions
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