Tujuan penelitian ini adalah untuk mengetahui Pengaruh Model Pembelajaran Problem Based Intructions terhadap kemampuan pemecahan masalah siswa. Penelitian ini dilaksanakan pada semester genap Tahun Ajaran 2015/2016 di SMA Muhammadiyah Tarakan. Jenis penelitian ini adalah quasi eksperimen dengan dengan rancangan Nonequivalent Control Group Design. Populasi siswa kelas X dan sampel sebanyak 2 kelas. Pengambilan sampel menggunakan teknik purposive sampling. Teknik pengumpulan data menggunakan dokumentasi, tes uraian dan lembar observasi. Berdasarkan pengujian statistik dengan menggunakan uji independent sample t-test diperoleh thitung 7,103 pada taraf signifikansi ? dan df = 66 diperoleh nilai ttabel
1,671 berarti thitung > ttabel. Berdasarkan keterangan di atas hal ini menunjukkan bahwa terdapat pengaruh Pengaruh Model Pembelajaran Problem Based Intructions terhadap kemampuan pemecahan masalah siswa kelas X SMA Muhammadiyah Tarakan.

The objective of this study was to determine the effect of Problem Based Instruction Learning Model on students' problem-solving abilities. The study was conducted in the second semester of 2015/2016 school year at SMA Muhammadiyah Tarakan. This study was a quasi experimental design by Nonequivalent Control Group Design. The population of students was tenth grade and the samples of this study were 2 classes. The used purposive sampling. The Data collection technique of this study used documentation, test descriptions and observation sheet. Based on statistical tests used independent sample t test obtained t-test 7.103 at significance level ? and df = 66 1,671 ttabel mean values obtained thitung> t tabel. Based on the above it indicated that there were significant Effects of Problem Based intructions Learning Model on problem-solving ability of tenth grade studens of SMA Muhammadiyah Tarakan.