<p><em>The ability to solve mathematical problems is one of the competencies that must be mastered by students so that learning objectives are achieved properly. Therefore, an appropriate method is needed in learning mathematics at school. The purpose of this study was to determine whether there was an influence of Type STAD Cooperative Learning on the mathematical problem solving abilities of class X students of SMKS Siti Banun TA. 2020-2021. This type of research is quantitative with quasi-experimental methods. The sampling technique in this study was saturated sampling consisting of two classes with each class consisting of 38 students. The instrument used in this study was a test of mathematical problem solving abilities in the form of a description. The research hypothesis was analyzed using the t-test. Based on the results of the analysis, it was concluded that there was an influence of Type-STAD cooperative learning on the mathematical problem solving abilities of class X students of SMK Siti Banun TA. 2020-2021. This is evidenced by the results of the analysis with the help of the SPSS program which shows a significance number of 0,00 < 0,05.</em></p><p><em><br /></em></p><p>Kemampuan pemecahan masalah matematis merupakan salah satu kompetensi yang wajib dikuasai oleh siswa agar tujuan pembelajaran tercapai dengan baik. Oleh karena itu, diperlukan metode yang tepat dalam pembelajaran matematika di sekolah. Tujuan penelitian ini adalah untuk mengetahui ada tidaknya pengaruh Pembelajaran Kooperatif Tipe STAD terhadap kemampuan pemecahan masalah matematis siswa kelas X SMKS Siti Banun TA. 2020-2021. Jenis penelitian ini adalah kuantitatif dengan metode kuasi eksperimen. Teknik pengambilan sampel dalam penelitian ini yaitu sampling jenuh yang terdiri dari dua kelas dengan masing-masing kelas terdiri dari 38 siswa. Instrumen yang digunakan dalam penelitian ini berupa soal tes kemampuan pemecahan masalah matematis berbentuk uraian. Hiptesis penelitian dianalisis menggunakan uji-t. Berdasarkan hasil analisis, diperoleh simpulan bahwa terdapat pengaruh pembelajaran kooperatif Tipe-STAD terhadap kemampuan pemecahan masalah matematis siswa kelas X SMK Siti Banun TA. 2020-2021. Hal ini dibuktikan dari hasil analisis dengan bantuan program SPSS yang menunjukkan angka signifikansi <em>0,00 < 0,05..</em></p>
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