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Common Core Teaching Resources

CCSS.MATH.CONTENT.1.OA.B.3

Grade 1 > Standards for Mathematical Practice > Operations & Algebraic Thinking > 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.2 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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