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Grade 2 - Operations and Algebraic Thinking
Standard 2.OA.A.1 - Write a subtraction sentence to represent the word problem with numbers up to 100.
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.