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# Common Core MATH 1 OA 4 Grade 1 Operations And Algebraic Thinking Understand And Apply Properties Of Operations And The Relationship Between Addition And Subtraction

**Operations And Algebraic Thinking: Understand And Apply Properties Of Operations And The Relationship Between Addition And Subtraction.**

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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Double Ten Frame Add/SubtractNumber Line Subtraction 2Number Line Subtraction 3Number Bonds 2Fact Family Triangles #2Fact Family - Boxes 1Fact Family Houses #2Number Bonds 1Fact Family Houses #1Fact Family - Boxes 2Fact Family Triangles #1Mixed Math: B10Addition Squares: Level 2, Set 1Addition Squares: Level 1, Set 1Addition - Counter PicturesAddition Squares: Level 2, Set 3Addition Squares: Level 3, Set 3Addition Squares: Level 3, Set 2Addition Squares: Level 3, Set 1Addition Squares: Level 1, Set 3Addition Squares: Level 2, Set 2Addition Squares: Level 1, Set 2