Use addition and subtraction to solve one-step word problems. Students will learn that some words refer to addition, others subtraction:
|altogether||how many more|
|add||how many left|
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Conclude by leading this investigation:
2.OA.A.1: 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.