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1.OA

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Operations and Algebraic Thinking

1.OA.1Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart and comparing, with unknowns in all positions. (MP.1, MP.2)1.OA.2Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, by using objects, drawings and equations with a symbol for one unknown number to represent the problem. (MP.1, MP.4, MP.5)1.OA.3Apply properties of operations as strategies to add and subtract. (MP.2, MP.7)1.OA.4Understand subtraction as an unknown-addend problem. (MP.2, MP.7)1.OA.5Relate counting to addition and subtraction. (MP.5, MP.8)1.OA.6Add and subtract within 20. (MP.2, MP.7, MP.8)1.OA.7Understand the meaning of the equal sign and determine if equations involving addition and subtraction are true or false. (MP.2, MP.3)1.OA.8Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. (MP.1, MP.2)
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