<p class="Abstrak"><strong>Abstract:</strong> The purpose of this research is to know the effect of blended learning on students' critical thinking skills in the heat and temperature material. The sample of this study was students of SMA Negeri 5 Malang consisting of 2 class, that is XI G-3 class as a control and XI H-3 class as an experimental class with 34 people in each class. This research design used a posttest only control group that is analyzed quantitatively. The results of this research show that there is an effect significantly of blended learning on students' critical thinking skills in temperature and heat material.</p><strong>Abstrak:</strong> Tujuan penelitian ini adalah untuk mengetahui pengaruh <em>blended learning </em>pada keterampilan berpikir kritis siswa dalam materi suhu dan kalor. Sampel penelitian ini adalah siswa SMA Negeri 5 Malang yang terdiri dari dua kelas, yaitu kelas XI G-3 sebagai kelas kontrol dan kelas XI H-3 sebagai kelas eksperimen dengan 34 siswa di setiap kelas. Desain penelitian adalah <em>posttest only control group design</em> yang dianalisis secara kuantitatif. Hasil penelitian menunjukkan bahwa ada pengaruh yang signifikan dari <em>blended learning</em> pada keterampilan berpikir kritis siswa dalam materi suhu dan kalor.
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