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If 'a', 'b' and 'c' are any three numbers, then the properties of addition are:

* Associative: the value of a + (b + c) is the same as (a + b) + c;

* Additive identity: there exists zero (0) such that a + 0 = a;

* Additive inverse: for every number a there is an additive inverse, denoted by (-a), such that a + (-a) = (-a) + a = 0;

* Commutative: the value of a + b is the same as b + a;

* Closed: the value of a + b is another number in the original set of a and b, for example, if aand b are both integers, then a + b will also be an integer.

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Q: Properties of addition
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