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Standards/Math/Massachusetts/1.OA.B

1.OA.B

1.OA Operations and Algebraic Thinking
1.OA.A
1.OA.B
1.OA.B.31.OA.B.4
1.OA.C
1.OA.D

Understand and apply properties of operations and the relationship between addition and subtraction.

1.OA.B.3Apply properties of operations to add. For example, when adding numbers order does not matter. 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). When adding zero to a number, the result is the same number (Identity property of zero for addition).1.OA.B.4Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.
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