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This study examined whether different instructional strategies affect 1st through 3rd grade students’ (N = 541) math problem-solving behavior. Children were randomly assigned to one of three instructional conditions: a worked example, an accidental worked example, or a no-instruction condition. Children then completed a series of math tasks that required flexible use of addition and subtraction strategies. Students in the no-instruction condition typically took longer to complete the task at first. However, 2nd grade students in the worked example condition were less likely to produce a novel problem-solving strategy on a subsequent task. The results suggest that while some teaching strategies yield efficient math problem-solving from students, it might be at the cost of other desirable outcomes like creativity.