The purpose of this research to describe how far concept, procedure and calculation error are done by student and to know kind of error are dominant done by student in class IX MTs NU Salam. The type of this research is qualitative descriptive research. From analysis process, ascertainable that the student done the concept error 33%, procedure error 24%, and calculation error 43%.The calculation error are the most error doing by student.Threrefore, teacher shoud repair quality of learning activity in order to mathematics achievement of student increased.
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