1.OA.3
Apply properties of operations as strategies to add and subtract. (Students need not know the name of the property.) For example: 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). Demonstrate that when adding zero to any number, the quantity does not change (Identity property of addition).
Example Problems
Write an expression that is equivalent to using the associative property of addition.
Write an expression that is equivalent to using the commutative property of addition.
Write an expression that is equivalent to using the commutative property of addition.

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