Yes 0 is a number.
In the base-10 system, there are only those numerals for real numbers (positive and negative). In other bases, for example base-12 or "duodecimal" numbers, letters are used to indicate the other numerals, A for 11 and B for 12. Hexadecimal (base-16) is widely used in computing.
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Yes. Natural numbers are whole numbers starting from 1 and onwards 2, 3, 4.... basically any number you can add 1 to is a natural number
-3, -2, -1, 0, 1, 2
natural number means whose straiting from 1, 2, ................................. and counting numbers starting from 0,1, 2, ..........................................
-1
integer