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**Introduction**

**Property of natural numbers**

**(i) The first and the smallest natural number is 1.**

**(ii) Every natural number (except 1) can be obtained by adding 1 to the previous natural number.**

**(iii) For the natural number 1 there is no previous natural number**

**(iv) There is no last or greatest natural number.**

**(v) We cannot complete the counting of all natural numbers. We express this fact by saying that there are infinitely many natural numbers.**

**The number zero**

**(i) The number 0 is the first and the smallest whole number.**

**(ii) There in no last or greatest whole number.**