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Problem solving ability (PSA) is the ability that students have in solving problems related to mathematical concepts based on appropriate procedures. The aim of this research is to describe students' PSA as well as find out the types of errors made by students in working on PSA questions. The subjects in this research were 32 students of class XI MIPA 1 SMA Negeri 3 Denpasar. The data in this research was collected using PSA tests and interview drafts. This data was then analyzed using a qualitative descriptive approach. This research concluded that: 1) The average student PSA was 49.24 in the medium category, 2) the mistakes made by students were due to obstacles in processing mathematical processes and 3) the root of the problem was the lack of innovation in existing textbooks.
Jayantika et al. (Tue,) studied this question.