This research aimed to know the effectiveness of discovery learning model viewed by students understanding of mathematical concepts. The population of this research was all students of grade 7th of SMP Muhammadiyah 3 Bandar Lampung in academic year of 2014/2015 that was distributed into 4 classes. The sample of this research was determined by purposive sampling technique. This research used one group pretest posttest design. The result of data analysis showed that discovery learning model was not effective viewed by students understanding of mathematical concepts.Penelitian ini bertujuan untuk mengetahui efektivitas model discovery learning ditinjau dari pemahaman konsep matematis siswa. Populasi penelitian ini adalah seluruh siswa kelas VII SMP Muhammadiyah 3 Bandar Lampung tahun pelajaran 2014/2015 yang terdistribusi dalam empat kelas. Sampel penelitian ini ditentukan dengan teknik purposive sampling. Penelitian ini menggunakan one group pretest posttest design. Hasil analisis data menunjukkan bahwa model discovery learning tidak efektif ditinjau dari pemahaman konsep matematis siswa.Kata kunci: discovery learning, efektivitas, pemahaman konsep
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