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The initial problem that will be discussed in this study is the low ability of students to solve mathematical problems in class XI Accounting at SMK Negeri 1 Padangsidimpuan. This is obtained based on the results of daily tests of students, through interviews, and observations of the experience of teachers who teach at SMK. The purpose of the study was to analyze the effect of the inquiry method on students' mathematical problem solving abilities. This research is a class action research, the sample is class XI Accounting-2. The stages of implementation in this study are by designing, implementing, and reflecting collaborative and participatory actions with the aim of improving performance as a teacher so that students' abilities can improve. Based on the results of tests conducted in the first cycle obtained 70.97% ability of students to solve mathematical problems, while in the second cycle using the same method students' problem solving abilities obtained by 83.87%. So that conclusions can be drawn using the inquiry method the students' mathematical problem solving abilities can be increased.

Upaya Peningkatan Kemampuan Pemecahan Masalah Matematika Siswa melalui Penerapan Metode Inquiry