In lesson 6 you learned that the associative property of addition?
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In Lesson 6, you learned about the associative property of addition. The associative property states that when adding three or more numbers, the grouping of the numbers does not affect the final sum. In other words, you can change the grouping of the numbers being added and the result will remain the same. For example, (2 + 3) + 4 is equivalent to 2 + (3 + 4), both of which result in 9.