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K.OA.1

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Represent addition and subtraction with objects, fingers, mental images, drawings*, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or equations. *Drawings need not show details, but should show the mathematics in the problem. (This applies wherever drawings are mentioned in the Standards.)1.OA.1

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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.* *See Glossary, Table 1. ©CSL Associates, Inc. 2010-2015