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Properties of Rational Numbers - The Role of Zero (0)

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For example : 
2 + 0 = 0 + 2 = 2       (Addition of 0 to a whole number) 
– 5 + 0 = ... + ... = – 5    (Addition of 0 to an integer)
You will observ that  when you add 0 to a whole number, the sum is again that whole number. This happens for integers and rational numbers also. 
In general, 
a + 0 = 0 + a = a, where a is a whole number 
b + 0 = 0 + b = b, where b is an integer 
c + 0 = 0 + c = c, where c is a rational number 
Zero is called the identity for the addition of rational numbers. It is the additive identity for integers and whole numbers as well.

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