Since the answers to Exercise(a) and (b) are the same, we see that grouping the numbers differently when adding does not change the sum. This is known as the ________ property of addition.
Exercise(a) and (b)
Add. Recall that parentheses show you what to do first.
(a) (65 + 81) + 135
(b) 65 + (81 + 135)
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