#### Answer

Grouping the addition of numbers in any order does not change the sum. You can add numbers in any order.
For example, the sum of 3 + 5 + 6 may be found as follows.
(3 + 5) + 6 = 8 + 6 = 14 Parentheses tell us to add 3 + 5 first.
Another way to add the same numbers is 3 + (5 + 6) = 3 + 11 = 14. Parentheses tell us to add 5 + 6 first.
Either grouping gives a sum of 14 because of the associative property of addition.