The probabilistic thinking includes high order thinking skills (HOTS), which need to be trained to students through learning models. The probabilistic thinking Level of the students varies. So the purpose of the research is: (1) Want to know the high level of probabilistic thinking students SMP Muhammadiyah 3 Mlati Kabupaten Sleman, before and after following the model Prmbelajaran; (2) Want to know the effectiveness of cooperative learning model with peer tutor on heterogeneous group in raising the level of Probabilitik students of SMP Muhammadiyah 3 Mlati Kabupaten Sleman. The design of this research is research with the method of combination model or design concurrent trianggulation. The method of blending qualitative and quantitative analyses. The subject in this study was a grade IX students A and B of the odd semester of SMP Muhammadiyah 3 Mlati Kabupaten Sleman. Class IX A applies cooperative learning of NHT type and KLS IX B Implementing Cooperative learning of TGT type. With heterogeneous groups and peer tutors. The results of the study and its discussion gained interesting findings in this study, which is an effective learning Model to increase the level of probability thinking of SMP Muhammadyah 3 Mlati Sleman in solving probabilistic problems, is a learning model that blends three components (1) Cooperative Learning, (2) Heterorogative groups, and (3) peer tutors. This study was named the Learning model “Koophetebaya”.
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