Grade 1 > Standards for Mathematical Practice > Operations & Algebraic Thinking > Represent and solve problems involving addition and subtraction > CCSS.MATH.CONTENT.1.OA.A.2
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.
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CCSS.MATH.CONTENT.1.OA.A.2 teaching resources
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