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Common Core Teaching Resources

CCSS.MATH.CONTENT.1.OA.B.4

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.4
Understand 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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