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Common Core Teaching Resources

CCSS.MATH.CONTENT.1.OA.A.1

In Grade 1 Standards for Mathematical Practice Operations & Algebraic Thinking Represent and solve problems involving addition and subtraction
Use 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, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.