This research aims to identify and explain the problems students face when solving mathematics problems related to the operation of calculating mixed fractions. This research uses a qualitative approach and uses case studies as a research method. This research was conducted on 23 elementary school students in Serang Regency, Banten. The data collection used story questions about adding and subtracting mixed fractions and unstructured interviews. The collected data was analyzed in depth using qualitative methods (data reduction, data display, and conclusion) to obtain meaningful phenomena that occurred related to the difficulties faced by students. The research results show that students face problems in solving verbal problems, concepts and principles. Other findings also show that students who score above the minimum completion standard (KKM) experience difficulty in solving mathematics problems related to adding and subtracting mixed fractions. This research can be a reference for other research to research or overcome the difficulties faced by elementary school students, especially in learning mathematics.
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