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Abstract. The study aim knows the factors cause the learning outcomes of students unreachable the standard minimum criteria (KKM) on mathematics learning. The method used in this study was qualitative descriptive. The subjects research used the purposive sampling method. Data collection tools are questionnaires about the factors that cause students to unreachable KKM. techniques data analysis uses a percentage formula. The conclusion of this research is the main cause of the students to get the value below KKM on mathematics teaching is the lack of motivation that exists in the students, the skill in learning mathematics is still very low, the health of Students Very influential about the learning process. In addition to the internal factors, there are also external factors, the external factor consists of the teachers and aspects of the parent. Students feel motivated to learn if the teacher uses media or mathematical aids. Another external factor is parents, parents have given cellphones to their children. These two factors cause students not to reach the KKM mathematics learning.