Midcontinent Research for Education and Learning
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Reference
Common Core Mathematics K2
Cluster
Represent and solve problems involving addition and subtraction.
Grade 2
2.OA.1.
Use addition and subtraction within 100 to solve one and twostep word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.