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The purpose of this study was to analyze the mathematical problem solving abilities of eighth grade students of junior high school on the material of flat side space. This type of research is descriptive qualitative. The subjects in this study were students of class VIII E at SMPN 1 Takengon as many as 28 students. The instrument used in this research is a test of students' mathematical problem solving ability, which consists of two questions and a semi-structured interview sheet. The results showed that students' problem-solving abilities were in low qualification, many students did not perform indicators of looking back at the results obtained and were still wrong in understanding the problem, but were able to plan problem solving and implement problem solving. Thus, it is recommended for educators to present non-routine questions to students so that students are more accustomed to solving problems that are considered difficult.

problem solving, Polyhedron