<![CDATA[This quasi research aimed to find out the effectiveness of cooperative learning model of modified jigsaw type in terms of students mathematical problem solving skills. The population of this research was all students of grade VII in SMP Negeri 1 Sukoharjo in academic year of 2016/2017 that were distributed into nine classes. The sample was selected one class randomly from nine classes and all students of VII B class were selected. The design which was used was one group pretest-posttest. The analysis data used t-test. The research data were obtained through the test of mathematical problem solving skills. The result of this research indicated that students mathematical problem solving skill after following cooperative learning of modified jigsaw type was not better than student's mathematical problem solving skill before following cooperative learning of modified jigsaw type. Thus, cooperative learning model of modified jigsaw type was not effective in terms of students mathematical problem solving skills.Penelitian eksperimen semu ini bertujuan untuk mengetahui efektivitas model pembelajaran kooperatif tipe modified jigsaw ditinjau dari kemampuan pemecahan masalah matematis siswa. Populasi penelitian ini adalah seluruh siswa kelas VII semester genap SMP Negeri 1 Sukoharjo tahun pelajaran 2016/2017 yang terdistribusi dalam sembilan kelas. Sampel dipilih satu kelas secara acak dari sembilan kelas dan seluruh siswa kelas VII B terpilih. Desain yang digunakan adalah one group pretest-posttest. Analisis data menggunakan uji-t. Data penelitian diperoleh melalui tes kemampuan pemecahan masalah matematis. Hasil penelitian ini menunjukkan bahwa kemampuan pemecahan masalah matematis siswa setelah mengikuti pembelajaran kooperatif tipemodified jigsaw tidak lebih baik daripada kemampuan pemecahan masalah matematis siswa sebelum mengikuti pembelajaran kooperatif tipe modified jigsaw. Dengan demikian, pembelajaran kooperatif tipe modified jigsaw tidak efektif ditinjau dari kemampuan pemecahan masalah matematis siswa.Kata kunci: efektivitas, modified jigsaw, pemecahan masalah matematis]]>
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