1.OA.3

Apply (not necessary to name) properties of operations as strategies to add and subtract. Examples: 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+6+4=2+10=12. (Associative property of addition.) To add 0 to any number, the answer is that number 7+0=7 (Additive identity property of 0.) Students need not use formal terms for these properties.

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