Teaching your students about missing addends and numbers? This file might be helpful. Inside you'll find hands on activites, flashcards, worksheets, game boards, puzzles and quizzes.
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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.