In the typical event of "Reasons for Students' Operation Errors" in Rational Number Operation, there are existing experiences, understandings and updates on how to understand and understand the reasons for students' operation errors, and it can be seen from the "Overview of Distribution of Errors" provided by them and the technical platform that "unclear understanding of concepts" and "miscalculation" are the two most common reasons for errors. Among them, "miscalculation" is commonly referred to as "carelessness". In the past, teachers' experience in solving "carelessness" was through more practice, but in fact, more practice did not solve the problem of "miscalculation" well. In order to further analyze and study the causes of students' "miscalculation", researchers and teachers think that students' metacognitive awareness and ability is one of the important reasons for "miscalculation" while interviewing students and combining with metacognitive theory. Here, the contradiction between the inherent understanding of students' operation reasons and new ideas is the third-level contradiction.
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