CCLS - Math: 2.OA.1

Operations And Algebraic Thinking
Represent And Solve Problems Involving Addition And Subtraction.
State Standard:
Use addition and subtraction within 100 to solve one- and two-step 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.1