<![CDATA[This research aimed to find out the influence of contextual teaching and learning towards students mathematical conceptual understanding. The population of this research was all students of grade ninth of SMP 4 Gedong Tataan in odd semester academic years of 2014/2015 as many as 143 students that was distributed into four classes (IXA - IXD). The samples were taken by purposive sampling and it was obtained students of IXD as experimental class and IXC as control class. This research used post-test only control design. The data of this research were score of students mathematical conceptual understanding which was obtained by test. Based on the results of data analysis, it was known that the students mathematical conceptual understanding with CTL was higher than conventional learning. Thus, the implementation of CTL affects towards students mathematical conceptual understanding.Penelitian ini bertujuan untuk mengetahui pengaruh contextual teaching and learning terhadap pemahaman konsep matematis siswa. Populasi penelitian ini adalah seluruh siswa kelas IX SMP Negeri 4 Gedong Tataan semester ganjil tahun pelajaran 2014/2015 sebanyak 143 siswa yang terdistribusi dalam empat kelas (IXA IXD). Sampel diambil secara purposive sampling dan diperoleh siswa kelas IXD sebagai kelompok eksperimen dan siswa kelas IXC sebagai kelompok kontrol. Penelitian ini menggunakan post-test only control design. Data penelitian ini berupa skor pemahaman konsep matematis siswa yang diperoleh melalui tes. Berdasarkan hasil analisis data, diketahui bahwa rata-rata pemahaman konsep matematis siswa dengan CTL lebih dari pembelajaran konvensional. Dengan demikian, penerapan CTL berpengaruh terhadap pemahaman konsep matematis siswa.Kata kunci: contextual teaching and learning, konvensional, pemahaman konsep matematis]]>
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