<![CDATA[This quasi experimental research aimed to find out the effectiveness of discovery learning model in terms of students mathematical conceptual understanding. The population of this research was students of 8th grade in SMP Negeri 1 Punggur in academic year of 2016/2017 that were distributed into 9 classes. The samples of this research were students of VIII A and VIII B class which were chosen by purposive sampling technique. The design of this research was pretest-posttest control group design. The instrument of this research was test of mathematical conceptual understanding. The data analysis of this research used two-point equality test is t test and one-side proportion test. Based on the result of the research, it was concluded that discovery learning model was not effective in terms of students mathematical conceptual understanding.Penelitian eksperimen semu ini bertujuan untuk mengetahui efektivitas model discovery learning ditinjau dari pemahaman konsep matematis siswa. Populasi penelitian ini adalah seluruh siswa kelas VIII SMP Negeri 1 Punggur tahun pelajaran 2016/2017 yang terdistribusi dalam sembilan kelas. Sampel dalam penelitian ini adalah siswa kelas VIII A dan VIII B yang diambil dengan teknik purposive sampling. Penelitian ini menggunakan pretest-posttest control group design. Instrumen penelitian ini adalah instrumen tes pemahaman konsep matematis. Analisis data penelitian ini menggunakan uji kesamaan dua rata-rata yaitu uji t dan uji proporsi satu pihak. Berdasarkan hasil penelitian, model discovery learning tidak efektif ditinjau dari pemahaman konsep matematis siswa.Kata kunci: efektivitas, model discovery learning, pemahaman konsep matematis]]>
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