Zero is a whole number because it’s part of the set of whole numbers, which includes 0 and all the positive numbers (1, 2, 3, and so on). Whole numbers are the numbers we use for counting, and zero is the starting point of that count. So, when we talk about whole numbers, we always include zero along with the positive numbers. For example, if we say “whole numbers up to 3,” it includes 0, 1, 2, and 3.
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Why is zero a whole number?
Here’s why zero is considered a whole number:

Definition of Whole Numbers:
 Whole numbers are the set of numbers {0, 1, 2, 3, …}, including zero and all the positive integers.

Integers and Zero:
 Zero is an integer, and integers consist of both positive and negative whole numbers, including zero.

Inclusion in the Set:
 When we talk about the set of whole numbers, it encompasses zero along with all the positive integers.
Examples of whole numbers, including zero:
 0 (Zero): Zero is a whole number because it is part of the set of whole numbers.
 1, 2, 3, … (Positive Integers): These are whole numbers because they are both positive and integers.
 1, 2, 3, … (Negative Integers): While these are integers, they are not considered whole numbers. Whole numbers only include nonnegative integers (0 and positive integers).
In other terms,
Imagine you have a line of numbers you use for counting. You start with 0, then go on to 1, 2, 3, and so on. All these numbers together are called whole numbers. Now, because 0 is the starting point of counting, we include it in the group of whole numbers. So, zero is like the special friend at the beginning of the counting line, and that’s why we call it a whole number!