it is the commutative property of addition
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It is the commutative property of addition.
If you have ONLY additions, you can add numbers in any order. Similarly, if you have ONLY multiplications, you can multiply in any order. Both rules follow from the commutative and associative properties of addition, and of multiplication, respectively.
There are two concepts here that are often confused. If you mean that the order of the operation of addition can be carried out in any order then it is the property of associativity. If you mean that the numbers can be written in any order then the property is commutativity.
In symbols, this property is that for any numbers a and b, a + b = b + a. Informally it says that adding a to b is the same as adding b to a; or it does not matter whether you start at the top or the bottom when adding numbers.
Any +++ Strictly speaking, it is ADD. The word 'sum' is used colloquially for any simple arithmetical calculation, but in mathematics a 'sum' is properly the result of adding two or more numbers.