180 Copyright ã 2020, Jurnal Absis e-ISSN 2654-8739, p-ISSN 2655-4518 Vol 2 No 2 April 2020 Mardiana, Deswita, Isharyadi PENGARUH MODEL PEMBELAJARAN CORE (CONNECTING, ORGANIZING, REFLECTING, EXTENDING) TERHADAP KEMAMPUAN KONEKSI MATEMATIS SISWA KELAS VIII SMP N 3 RAMBAH Mardiana 1 , Hera Deswita 2 , Ratri Isharyadi 3 1,2,3 Universitas Pasir Pengaraian mardianaaa2018@gmail.com ABSTRACT The low ability of students' mathematical connections is caused by the lack of linking learning with previous material and the tendency of students to memorize concepts or formulas. This study aims to see whether there is an effect of the CORE learning model on the mathematical connection ability of grade VIII students of SMPN 3 Rambah. This type of research is a quasi-experimental research with a Two-Group Posttest Only research design. The population in this study were students of class VIII SMPN 3 Rambah. Sampling using simple random sampling technique, class VIII.3 as the experimental class, and class VIII.1 as the control class. The CORE learning model is applied in the practical class, while conventional learning is applied in the control class. The mathematical connection ability data obtained by the test technique. The instrument used was a valid and reliable mathematical connection ability test item. Data analysis was performed for hypothesis testing. Based on the prerequisite test results, it was found that the data were not normally distributed, so that the hypothesis testing was carried out using the Mann Whitney test. The result of the calculation is 3.81 > 1.96 with a value of 0.05, so reject H0 so that it can be concluded that there is an effect of the CORE learning model on the mathematical connection ability of grade VIII students of SMPN 3 Rambah. Keywords: Relating, Experiencing, Applying, Cooperating, and Transferring (REACT), mathematical connection ability. ABSTRAK Penelitian ini bertujuan untuk mengetahui ada atau tidaknya pengaruh strategi pembelajaran Relating, Experiencing, Applying, Cooperating, and Transferring (REACT) terhadap kemampuan komunikasi matematis siswa kelas VII di MTs Ash-Shohibiyah Bangun Purba. Jenis penelitian ini adalah penelitian Quasi Eksperiment dengan desain the Posttest Only Control Group Design. Populasi pada penelitian ini adalah siswa kelas VII MTs Ash- Shohibiyah Bangun Purba dengan sampel kelas VII.1 dan kelas VII.2. Sampel diperoleh menggunakan teknik random sampling. Kelas eksperimen menggunakan strategi REACT, sedangkan kelas kontrol menggunakan pembelajaran konvensional. Instrumen penelitian ini adalah soal uraian kemampuan komunikasi matematis. Data posttest kemampuan komunikasi matematis yang diperoleh dilakukan analisis data untuk menguji hipotesis. Hasil uji normalitas diperoleh data berdistribusi normal dan hasil uji homogenitas diperoleh data memiliki varian yang tidak homogen. Pengujian hipotesis menggunakan uji t’ karena data berdistribusi normal dan tidak homogen, hasil perhitungan diperoleh kesimpulan bahwa ada pengaruh strategi pembelajaran Relating, Experiencing, Applying, Cooperating, and Transferring (REACT) terhadap kemampuan komunikasi matematis siswa kelas VII di MTs Ash- Shohibiyah Bangun Purba. Kata-kata Kunci : Relating, Experiencing, Applying, Cooperating, and Transferring (REACT), kemampuan koneksi matematis.