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Standards/Math/North Dakota/2.OA

2.OA

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2.OA
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Operations and Algebraic Thinking

2.OA.1Use strategies to add and subtract within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions.2.OA.2Use mental strategies to fluently add and subtract within 20.2.OA.3Determine whether a given number of objects up to 20 is odd or even. Write an equation to represent an even number using two equal addends or groups of 2.2.OA.4Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns. Write an equation to express the total as a sum of equal addends.
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