ABSTRAK Penelitian ini memiliki tujuan untuk mengetahui perbedaan efektivitas model Problem Based Learning dan Problem Solving terhadap kemampuan berpikir kritis siswa kelas 5 pada pembelajaran matematika. Penelitian ini termasuk penelitian eksperimen semu. Sampel pada penelitian ini yaitu 23 siswa SDN Gedangdowo 02 dan 18 siswa SDN Soko. Keberhasilan penelitian ini dilihat berdasarkan hasil analisis uji N-Gain untuk mengetahui keefektifannya, eksperimen 1 yang menggunakan model Problem Based Learning dan kelas eksperimen 2 menggunakan model Problem Solving. Hasil uji N-Gain menunjukkan kelas eksperimen 1 sebesar 0,59 dan kelas eksperimen 2 sebesar 0,50. Berdasarkan hasil penelitian dikatakan H 0 ditolak dan H a diterima. Kesimpulannya adalah terdapat peningkatan kemampuan berpikir kritis antara siswa kelas V SDN Gedangdowo 02 menggunakan model pembelajaran Problem Based Learning dengan siswa kelas V SDN Soko menggunakan model pembelajaran Problem Solving. Dari hasil penelitian merekomendasikan pembelajaran dengan model Problem Based Learning dapat meningkatkan kemampuan berpikir kritis siswa, sebaiknya dijadikan alternatif dalam kegiatan pembelajaran matematika pada materi volume bangun ruang kubus dan balok. Kata kunci: berpikir kritis, problem based learning, problem solving, ABSTRACT This study aims to determine the differences in the effectiveness of the Problem Based Learning and Problem Solving models on 5th grade students' critical thinking skills in mathematics learning. This research includes quasi-experimental research. The sample in this study were 23 students of SDN Gedangdowo 02 and 18 students of SDN Soko. The success of this study was seen based on the results of the N-Gain test to determine its effectiveness, experiment 1 using the Problem Based Learning model and experimental class 2 using the Problem Solving model. The results of the N-Gain test show that the experimental class 1 is 0.59 and the
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