Technically, It's because of the commutative property of addition. If you think about it though, it's just as easy to explain using common sense. If you have $10 and your mom gives you $5, you have $15 total. If on the other hand you have $5 and your mom gives you $10, you have $15 total. See how it doesn't matter what order you add things in?
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NO mean: (average)add all the numbers, then divide by how many numbers you added!! Median: you have to put allthe numbers in order and then get the middle number and if there are two middle numbers add them and divide them by two!!
I think you are referring to the commutative law for addition : a+b = b+a.
If you simply add numbers the answer is the sum of those numbers.
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because you must, in order to do the inverse operation of multiplication you must perform division. division makes the numbers smaller which is very important in certain equations and word problems.