Standard

CCSS.Math.Content.1.OA
Operations and Algebraic Thinking
CCSS.Math.Content.1.OA.B
Understand and apply properties of operations and the relationship between addition and subtraction.
CCSS.Math.Content.1.OA.B.3
Apply properties of operations as strategies to add and subtract. 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 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.)
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