Explanation :
Zero has an Additive Identity for Whole Numbers, i.e. when Zero is added to any given whole number, the resultant number is always equal to the given whole number.
In other words, Zero does not affect any change in an addition expression.
Study the following examples :
Example 1 : 4 + 0 = 4
Example 2 : 24 + 0 = 24
Example 3 : 888 + 0 = 888
Example 4 : 0 + 33 = 33
Example 5 : 0 + 9 = 9
Example 6 : 0 + 427 = 427
From the above examples you can learn that sum of Zero and any given whole number, always gives the result which is equal to the given whole number.
So we can say, Zero has an additive Identity for Whole Numbers

