<![CDATA[Abstrak Penelitian diadakan karena minimnya kecakapan siswa kelas V SDN Dukuh Menanggal I/424 Surabaya dalam berpikir secara kritis materi sistem pernapasan manusia. Penelitian termasuk pada jenis Quasi Experimental yang terancang Non Equivalen Control Group Design, dimana populasi diambil dari kelas V sejumlah 106 siswa, dengan sampel yaitu VA sejumlah 36 siswa dan VB sejumlah 33 siswa serta menggunakan purposive sampling untuk pemilihan sampelnya. Penelitian ini mengumpulkan datanya dengan tes berbentuk pilihan ganda 5 soal dan uraian 15 soal. Sedangkan data dianalisa dengan uji prasyarat melalui normalitas dan homogenitas serta uji hipotesis. Berdasarkan perhitungan T-Test mendapatkan nilai Sig. < 0,05 dan bermakna ada perbedaan, sehingga dapat diambil kesimpulan ada keberhasilan model problem based learning dalam membangun kemampuan dalam berpikir secara kritis materi sistem pernapasan manusia. Abstract The research was conducted due to the lack of ability of class V at SDN Dukuh Menanggal I/424 Surabaya in thinking critically about the human respiratory system. The research was included in the Quasi Experimental type which was designed as a Non Equivalent Control Group Design, where the population was taken from class V with a total of 106 students, with a sample of 36 students VA and 33 students of VB and used purposive sampling for the selection of the sample. This study collected data using a multiple choice test with 5 questions and 15 questions with a description. While the data was analyzed by prerequisite test through normality and homogeneity as well as hypothesis testing. Based on the calculation of the T-Test to get a Sig. < 0.05 and means there is a difference, so it can be concluded that there is a success of the problem based learning model in building the ability to think critically about the material of the human respiratory system.]]>
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