Abstrak Penelitian ini bertujuan untuk mengetahui adakah pengaruh yang signifikan pendekatan matematika realistik (PMR) terhadap kemampuan komunikasi matematis kelas V di UPTD SDN Sadah 1. Penelitian ini merupakan penelitian kuantitatif dengan menggunakan desain Quasi Eksperimental jenis Nonequivalen Control Group Design. Penelitian ini dilaksanakan pada kelas V UPTD SDN Sadah 1 yang berjumlah 49 siswa. Sampel diambil dengan menggunakan teknik sampling jenuh. Instrumen yang digunakan adalah lembar tes komunikasi matematis dan lembar observasi. Hasil penelitian menunjukkan bahwa ada pengaruh yang signifikan pendekatan matematika realistik (PMR) terhadap kemampuan komunikasi matematis berdasarkan hasil perhitungan statistik dengan uji t dua sampel independent diperoleh thitung = 6,055 dan ttabel = 2,012, dengan taraf signifikan 0,05. Sesuai dengan kaidah pengujian thitung > ttabel maka Ho ditolak dan Ha diterima. Apabila ada perbedaan signifikan rata-rata nilai posttest, yaitu nilai rata-rata posttest kelas eksperimen lebih besar dari rata-rata nilai posttest kelas kontrol. Berdasarkan perhitungan tersebut dapat disimpulkan bahwa ada pengaruh yang signifikan pendekatan matematika realistik (PMR) terhadap kemampuan komunikasi matematis kelas V di UPTD SDN Sadah 1. Kata Kunci: Pendekatan Matematika Realistilk, Komunikasi Matematis.

Abstract This study has an objective to know whether there is a significant effect of the realistic mathematical approach (PMR) on mathematical communication skills in fifth grade at UPTD SDN Sadah 1. This study is a type of quantitative research and the design that used is Quasi Experimental design with a type of Non-Equivalent Control Group Design. This study was conducted in class fifth grade of UPTD SDN Sadah 1 uses 49 students. The samples were taken by using saturated sampling technique. The instruments were test sheets of mathematical communication and observation sheets. The results of the study show that there is a significant effect of the realistic mathematical approach (PMR) on mathematical communication skills based on the results of statistical calculations with the t test of two independent samples that is tcount = 6.055 and ttable = 2.012, with a significance level of ? = 0.05. In accordance with the rules of testing tcount > ttable then Ho is rejected Ha is accepted. If there is a significant difference in the average value of the posttest between the experimental group and the control group, where the average value of the experimental group is greater than the control group. Based on these calculations, it can be concluded that there is a significant effect of the realistic mathematical approach (PMR) on mathematical communication skills in fifth grade at UPTD SDN Sadah 1. Keywords: Realistic Mathematical Approach, Mathematical Communication.

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