<![CDATA[This research aimed to know the effectiveness of the cooperative learning model of think talk write (TTW) type viewed by the increasing of student`s mathematical communication ability. The population of this research was all students of grade 8th of Junior High School 3 Jati Agung, even semester in academic year of 2014/2015 which was distributed into five classes, then it was chosen two classes as samples by purposive random sampling technique. The design which was used was a pre-test post-test control group. Based on the analysis of data, cooperative learning model of TTW type was less effective to increase student`s mathematical communication ability.Penelitian ini bertujuan untuk mengetahui efektivitas model pembelajaran kooperatif tipe think talk write (TTW) ditinjau dari peningkatan kemampuan komunikasi matematis siswa. Populasi penelitian ini adalah seluruh siswa kelas VIII SMP Negeri 3 Jati Agung semester genap tahun pelajaran 2014/2015 yang terdistribusi dalam lima kelas, kemudian dipilih dua kelas sebagai sampel menggunakan teknik purposive random sampling.Desain yang digunakan yaitu pre-test post-test control group.Berdasarkan analisis data, model pembelajaran kooperatif tipe TTW kurang efektif untuk meningkatkan kemampuan komunikasi matematis siswa.Kata kunci: efektivitas, kemampuan komunikasi matematis, TTW]]>
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