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The students need to give more attention to their problem solving skills. Some of them still feel difficult to interpret in suitable ways. The purpose of this study was to identify the relation between mathematics problem solving skills and self-efficacy in the Chapter Lines and Angles of the students of MTs N 2 Pemalang. The population of this research was the students of seventh grade in MTs N 2 Pemalang. By simple random sampling technique, class 7A was selected as the sample of the research. A mixed method was used, including quantitative and qualitative approach. The result of the research showed that (i) there was significant impact between self efficacy and problem solving skills in the score of the students (ii) the students with high self-efficacy answered the questions with detail and complete answers. The steps that the students did were correct and suitable with the problems. It showed that their problem solving skills were excellent (iii) the students with low self-efficacy answered the question by not giving the detailed information. It showed that they still struggled with their problem solving skills