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Common Core Teaching Resources

CCSS.MATH.CONTENT.1.OA.A.2

In Grade 1 Standards for Mathematical Practice Operations & Algebraic Thinking Represent and solve problems involving addition and subtraction
Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.