Problem

Since the answers to Exercise(a) and (b) are the same, we see that grouping the numbers di...

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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