<![CDATA[This quasi experimental study was aimed to find out the effect of PBL model on student’s understanding of mathematical concept. The population of this study was all eighth grade students of SMP Negeri 7 Bandarlampung in the odd semester of academic year of 2018/2019 as many as 305 students that were distributed into ten classes. The samples of this study were students of VIII-2 class as many as 30 students and VIII-3 class as many as 29 students who were selected by using cluster random sampling technique. The design used was the randomized control group pretest posttest design. The data analysis used was thet Mann-Whitney U test. The results of data analysis showed that the median of gain score of student’s understanding mathematical concept in PBL model was higher than the median of gain score of student’s mathematical concept in conventional learning. Thus, the PBL model affects the student’s understanding of mathematical concept.Keywords: understanding of mathematical concept, problem based learning Penelitian quasi experiment ini bertujuan untuk mengetahui pengaruh model PBL terhadap pemahaman konsep matematis siswa. Populasi penelitian ini adalah seluruh siswa kelas VIII SMP Negeri 7 Bandar-lampung semester ganjil tahun pelajaran 2018/2019 sebanyak 305 siswa yang terdistribusi ke dalam 10 kelas. Sampel penelitian ini adalah siswa kelas VIII-2 sebanyak 30 siswa dan kelas VIII-3 sebanyak 29 siswa yang dipilih menggunakan teknik cluster random sampling. Desain yang digunakan adalah the randomized control group pretest posttest design. Analisis data yang digunakan adalah uji Mann-Whitney U. Hasil analisis data menunjukkan bahwa median gain skor pemahaman konsep matematis siswa dengan model PBL lebih tinggi daripada median gain skor pemahaman konsep matematis siswa dengan pembelajaran konvensional. Dengan demikian, model PBL berpengaruh terhadap pemahaman konsep matematis siswa.Kata kunci: pemahaman konsep matematis, problem based learning]]>
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