What are the properties of subtraction?

Properties of Subtraction:

1. If a and b are two whole numbers such that $a > b$ or $a = b$, then $a – b$ is a whole number. If $a < b$, then subtraction $a – b$ is not possible in whole numbers.

2. The subtraction of whole numbers is not commutative, that is, if a and b are two whole numbers, then in general $a – b$ is not equal to $(b – a)$.

3. If a is any whole number other than zero, then $a – 0 = a$ but $0 – a$ is not equal to a.

4. The subtraction of whole numbers is not associative. That is, if a, b, c are three whole numbers, then in general $a – (b – c)$ is not equal to $(a – b) – c$.

5. If a, b and c are whole numbers such that $a – b = c$, then $b + c = a$.