CCSS.Math.Content.1.OA.B.3
Apply properties of operations as strategies to add and subtract.<sup>2</sup> <i>Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2
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