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Kemampuan penalaran aljabar siswa masih rendah. Pembelajaran yang digunakan guru belum sepenuhnya melatih kemampuan penalaran aljabar siswa. Penelitian ini bertujuan untuk mendeskripsikan kemampuan penalaran aljabar siswa sebelum dan setelah pembelajaran serta untuk mengetahui efektivitas model pembelajaran kooperatif tipe jigsaw terhadap kemampuan penalaran aljabar siswa. Desain penelitian ini adalah one group pretest-posttest design. Populasi penelitian ini adalah seluruh siswa kelas X SMA Negeri 11 Kendari yang terdiri dari dua kelas paralel. Sampel penelitian diambil secara simple random sampling dan diperoleh kelas X-MIA 1 sebagai kelas eksperimen dengan jumlah siswa sebanyak 30 orang. Data dikumpulkan melalui pemberian tes kemampuan penalaran aljabar berbentuk uraian. Data dianalisis secara deskriptif dan inferensial dengan uji t pada taraf signifikansi 0,05. Hasil penelitian menunjukkan bahwa: (1) Kemampuan penalaran aljabar siswa sebelum pembelajaran belum mencapai ketuntasan klasikal dimana nilai rata-rata yang diperoleh hanya mencapai 36,17; (2) Kemampuan penalaran aljabar siswa setelah pembelajaran telah mencapai ketuntasan klasikal dimana nilai rata-rata yang diperoleh mencapai 82,83; dan (3) Model pembelajaran kooperatif tipe jigsaw efektif diterapkan dalam pembelajaran matematika untuk mendukung kemampuan penalaran aljabar siswa

Critical thinking skills of mathematics students are still low. Teachers lack training critical thinking ability of students during learning. This study aims to examine differences influence learning model group investigation and conventional learning models to the critical thinking skills of mathematics students. The research design was pretest-posttest control group design. The study population was all students in grade X SMAN 3 Kendari comprising 9 parallel classes. Samples were taken by purposive sampling, such as taking two classes that have the mathematical ability and the variance is relatively the same. Both classes were then randomized to determine the experimental class (34 students) and control class (32 students). Data collected through the provision of critical thinking skills tests as essay test form. Data was analyzed by descriptive and inferential test using t test at the 0.05 significance level. The results showed that: (1) there is an effects of the application of learning model group investigation of the critical thinking skills of mathematics students with an average N-Gain of 0.55 (medium); (2) there is an effect of the application of conventional learning models to the critical thinking skills of mathematics students with an average N-Gain of 0.283 (low); and (3) application of the learning model group investigation is more influential than the application of conventional learning model to mathematics students' critical thinking skills