Penelitian ini dilatarbelakangi oleh kemampuan pemahaman konsep matematika siswa yang masih tergolong rendah. Tujuan penelitian ini yaitu untuk mengetahui pengaruh positif dan signifikan model pembelajaran Problem Based Learning terhadap kemampuan pemahaman konsep matematika siswa pada kelas XI IPA SMA Negeri 1 Sesenapadang. Lokasi dalam penelitian ini dilaksanakan di SMA Negeri 1 Sesenapadang kelas XI IPA tahun ajaran 2023/2024. Metode penelitian ini merupakan penelitian kuantitatif dengan jenis penelitian Preexperimental design dengan desain One group pretest-posttest. Tahapan model pembelajaran Problem Based Learning yang digunakan yaitu: orientasi siswa pada masalah, mengorganisasikan siswa untuk belajar, membimbing penyelidikan individual maupun kelompok, mengembangkan dan menyajikan hasil karya serta menganalis dan mengevaluasi proses pemecahan masalah. Teknik pengambilan sampel menggunakan teknik sampling jenuh dengan sampel berjumlah 21 siswa. Instrumen yang digunakan yaitu tes kemampuan pemahaman konsep, lembar observasi keterlaksanaan pembelajaraan guru dan aktivitas siswa. Hasil penelitian menunjukkan bahwa terdapat peningkatan kemampuan pemahaman konsep siswa
setelah menerapkan model pembelajaran Problem Based Learning. Rata-rata nilaipretest sebesar 50,38 berada pada kategori sedang dan nilai rata-rata posttest sebesar 75,33 berada pada kategori tinggi lebih tinggi di bandingkan dengan nilaipretest. Berdasarkan hasil pengujuan hipotesis diketahui bahwa nilai sig (2-tailed)
sebesar 0,000 < 0,05. Dengan demikian model pembelajaran Problem Based Learning memberikan pengaruh yang positif dan signifikan terhadap kemampuan pemahaman konsep matematika siswa kelas. Oleh karena itu, dapat disimpulkan bahwa pemahaman konsep matematika siswa menggunakan model pembelajaran Problem Based Learning mengalami peningkatan yang signifikan.

This research is motivated by the students' ability to understand mathematical concepts which is still relatively low. The aim of this research is to determine the positive and significant influence o f the Problem Based Learning learning model on students' ability to understand mathematical concepts for class XI IPA SMA Negeri 1 Sesenapadang. The location of this research was carried out at SMA Negeri 1 Sesenapadang class XI Science in the2023/2024. This research method is quantitative research with a pre-experimental design research type with a one group pretest-posttest design. The stages of the Problem Based Learning learning model used are: orienting students to problems, organizing students to learn, guiding individual and group investigations, developing and presenting work results and analyzing and evaluating the problem solving process. The sampling technique used a saturated sampling technique with a sample of 21 students. The
instruments used were concept understanding ability tests, observation sheets on the implementation of teacher learning and student activities. The results of the research show that there is an increase in students' ability to understand concepts after implementing the Problem Based Learning learning model. The average pretest score was 50.38 in the medium category and the average posttest score was 75.33 in the high category, higher than the pretest score. Based on the results of hypothesis testing, it is known that the sig (2-tailed) value is 0.000 < 0.05. Thus, the Problem Based Learning learning model has a positive and significant influence on class students' ability to understand mathematical concepts. Therefore, it can be concluded that students' understanding of mathematical concepts using the Problem Based Learning learning model has increased significantly.