<![CDATA[This quasi experimental research aims to determine the effect of problem based learning model towards students' mathematical communication skill. The population of this research was all students of class VII in SMPN 2 Abung Selatan district of North Lampung in academic year 2017/2018 which were distributed in 6 classes. The sample of this research were students of class VII-2 and VII-3 selected by purposive sampling technique. This research used pretest-posttest control group design. Research data obtained through the test of students' mathematical communication skill. Data Analysis using t test. Based on the result of the research, it could be concluded that problem based learning model had influence towards students’ mathematical communication skill.Penelitian eksperimen semu ini bertujuan untuk mengetahui pengaruh model pembelajaran problem based learning terhadap kemampuan komunikasi matematis siswa. Populasi penelitian ini adalah seluruh siswa kelas VII SMPN 2 Abung Selatan Kabupaten Lampung Utara Tahun Pelajaran 2017/2018 yang terdistribusi dalam 6 kelas. Sampel penelitian ini adalah siswa kelas VII-2 dan VII-3 yang dipilih dengan teknik purposive sampling. Penelitian ini menggunakan desain pretest-posttest control group design. Data penelitian diperoleh melalui tes kemampuan komunikasi matematis siswa. Analisis data menggunakan uji-t. Berdasarkan hasil penelitian dan pembahasan, diperoleh kesimpulan bahwa model pembelajaran problem based learning berpengaruh terhadap kemampuan komunikasi matematis siswa.Kata kunci: komunikasi matematis, pengaruh, problem based learning]]>
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