Why is zero claasified as a whole number ?

When you first learned to count, you started with 1, 2, 3 and kept going until you couldn't remember what came next or grew tired of counting. These positive counting numbers (1, 2, 3, 4, ...) are callednatural numbers. The ... means the number list continues on infinitely.If you add the number 0 to the natural numbers, you get thewhole numbers(0, 1, 2, 3, ...). You also get an example of how a number can be classified as more than one type. For example, the number 2 is both a natural number and a whole number. In fact, all natural numbers are whole numbers, but not all whole numbers are natural numbers