I was wondering that $10$ is a Natural number or not as it contains $0$ (zero) in it which is not a Natural number for sure, so $10$ is a Natural number or not ?
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$\begingroup$10 is of course a natural number, the successor of 9.
That we humans have the agreement to write numbers in base-10 notation has no effect on the numbers themselves, just on how we represent them in writing to each other.
you could write 10 as 1010 in binary or 101 in tertiary or A in hex, or any other base and it is still 10.
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