Why 0 is called a whole number?

Dear student , 
Whole numbers : all non-negative integers 
Since 0 is a non-negative integer , it is a whole number .
Other whole numbers are 1,2,3,4,5........
Hope it clears your query .
Regards

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An?integer?(whole number) is a?number?which can be produced by adding and subtracting 1s together. For example, we can get to 5 by 1+1+1+1+1, or -3 by 1-1-1-1-1. We can get to?zero?by 1-1, so?0?is a?whole number.
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