AULADUNA: Jurnal Pendidikan Dasar Islam Vol. 6 No. 2, Desember 2019, pp. 164-172 p-ISSN: 2407-2451, e-ISSN: 2621-0282 DOI: https://doi.org/10.24252/auladuna.v6i2a7.2019 164 EFEKTIVITAS MODEL KOOPERATIF TWO STAY TWO STRAY (TS-TS) TERHADAP PEMAHAMAN KONSEP MATEMATIS SISWA SEKOLAH DASAR THE EFFECTIVENESS OF TWO STAY TWO STRAY (TS-TS) COOPERATIVE MODEL ON THE CONCEPT UNDERSTANDING OF THE STUDENTS’ MATHEMATICS IN ELEMENTARY SCHOOL Jusmawati Fakultas Keguruan dan Ilmu Pendidikan Universitas Megarezky Jl. Antang Raya No. 45, Makassar Email: jcjusmawati030490@gmail.com Abstrak Tujuan dari penelitian ini adalah untuk mengetahui efektivitas model kooperatif Two Stay Two Stray (TS-TS) terhadap pemahaman konsep matematika siswa SD Negeri Kassi Kota Makassar. Populasi dalam penelitian ini adalah seluruh siswa kelas IV SD Negeri Kassi Kota Makassar dan sampel kelas IVa sebagai kelas eksperimen diajar dengan model pembelajaran kooperatif Two Stay Two Stray (TS-TS) dengan teknik random sampling. Data yang dikumpulkan terdiri atas keterlaksanaan model pembelajaran kooperatif Two Stay Two Stray (TS-TS) melalui lembar observasi dan data pemahaman konsep matematika dikumpulkan melalui tes. Teknik analisis data yang digunakan adalah statistik deskriptif dan statistik inferensial. Analisis deskriptif keterlaksaan model pembelajaran dan pemahaman konsep matematika, analisis inferensial dengan uji prasyarat yakni uji normalitas dan uji homogenitas, analisis inferensial yakni uji t, pengujian hipotesis menggunakan uji paired sample T-test. Hasil penelitian menunjukkan bahwa: (1) keterlaksanaan model pembelajaran kooperatif Two Stay Two Stray (TS-TS) dalam pembelajaran matematika terlaksana dengan baik, (2) pemahaman konsep matematika siswa kelas IV SD Negeri Kassi Kota Makassar yang sebelumnya berada pada kategori rendah terdapat peningkatan setelah diterapkan model kooperatif Two Stay Two Stray (TS-TS) dari rata-rata pemahaman konsep matematika siswa yaitu 35,18 kemudian meningkat menjadi 84,14, dan (3) hasil uji hipotesis pada taraf siginifikan 0,05 dengan uji-t menunjukan bahwa H 0 ditolak dan H 1 diterima sehingga terdapat keefektifan model kooperatif Two Stay Two Stray (TS-TS) terhadap pemahaman konsep matematika sekolah dasar. Kata Kunci: Model Two Stay Two Stray (TS-TS), Pemahaman Konsep Matematika Abstract This research aimed to know the effectiveness of Two Stay Two Stray (TS-TS) model on understanding the Mathematics concept of SD Negeri Kassi of Makassar. The population was all of the fourth grade students at SD Negeri Kassi of Makassar and the sample was the IVa grade students at SD Negeri Kassi of Makassar. The experimental class was taught by using Two Stay Two Stray (TS-TS) learning model with random sampling technique. Data of Two Stay Two Stray (TS-TS) model were collected by observation sheet and data of mathematics concept understanding were collected by test. Techniques of data analysis were descriptive and inferential statistic. Descriptive statistic was used to measure learning model and understanding of mathematics concept. Inferential statistic used normality and homogenity test. It included t-test and hypotesis using paired sample t-test. The result of research indicated that (1) Two Stay Two Stray (TS-TS) model was implemented well, (2) understanding of mathematics concept to the fourth students of SD Negeri Kassi Makassar previously was low and got improvement after using Two Stay Two Stray (TS-TS) model. It was proved by mean score 35.18 improved to 84.14. (3) the result of hypothesis was 0.05 significant and t-test showed that H 0 was rejected and H 1 was accepted. Therefore, there was the effectiveness of Two Stay Two Stray (TS-TS) model on understanding mathematics concept in elementary school. Keywords: Two Stay Two Stray (TS-TS) Model, Understanding of Mathematics Concept