E-ISSN : 2579-9258 Jurnal Cendekia: Jurnal Pendidikan Matematika P-ISSN : 2614-3038 Volume 04, No. 02, November 2020, pp. 1023-1033 1023 DIFFERENCES IN SPATIAL MATHEMATICAL ABILITY OF STUDENTS GIVEN A MODEL LEARNING REALISTIC MATHEMATIS EDUCATION WITH STAD TYPE OF COOPERATIVE LEARNING Ara Yustiana 1 , Edi Syahputra 2 , Anita Yus 3 1, 2, 3 Pendidikan Matematika, Program Pascasarjana Universitas Negeri Medan, Jl. Willem Iskandar Pasar V Kenangan Baru, PercutSei Tuan, Deli Serdang, Indonesia, 20221 Arayustiana05@gmail.com Abstract The focus of this research is to analyze the students' spatial abilities and mathematical dispositions in 2 cooperative learning models. This study aims to determine (1) Is there any significant difference between students' spatial abilities taught by using Realistic Mathematic Education (RME) learning and students' spatial abilities taught by using STAD type of cooperative learning? (2) is there any interaction between learning and students' initial mathematics abilities against students' spatial abilities ? This research is a quasi-experimental research. The population of this study were students of class X MAN 2, 2019/2020 Deli Serdang. The research sample was taken randomly in order to obtain two sample classes. The experimental class I received the Realistic Mathematic Education (RME) learning model and the experimental class II received the STAD type of cooperative learning. The instrument are consisted of a spatial ability test and a learning disposition questionnaire. Data analysis was performed using two-way analysis of variance (ANOVA). The results showed that (1) there was a significant difference between students' spatial abilities taught by using Realistic Mathematic Education (RME) learning and students' spatial abilities taught by using STAD type of cooperative learning (2) there was an interaction between learning and students' initial mathematical abilities towards their spatial abilities. Keywords:Realistic Mathematic Education (RME), students' initial mathematics abilities, Student Teams Achievement Division (STAD), Spatial, ANAVA Abstrak fokus penelitian ini adalah untuk menganalisis kemampuan spasial dan disposisi matematis siswa pada 2 model pembelajaran kooperatif. Penelitian ini bertujuan untuk mengetahui (1) apakah terdapat perbedaan yang signifikan antara kemampuan spasial siswa yang diajar melalui pembelajaran Realistic Mathematic Education (RME) dan kemampuan spasial siswa yang diajar melalui pembelajaran kooperatif tipe STAD? (2) apakah terdapat interaksi antara pembelajaran dan kemampuan awal matematika siswa terhadap kemampuan spasial siswa? Penelitian ini merupakan penelitian eksperimen semu. Populasi penelitian ini adalah siswa kelas X MAN 2 Deli Serdang. Sampel penelitian diambil secara acak sehingga diperoleh dua kelas sampel. Kelas eksperimen I mendapat model pembelajaran Realistic Mathematic Education (RME) dan kelas eksperimen II mendapat pembelajaran kooperatif tipe STAD. Instrumen yang digunakan terdiri dari tes kemampuan spasial dan angket disposisi belajar. Analisis data dilakukan dengan analisis varians dua jalur (ANAVA). Hasil penelitian menunjukkan bahwa (1) terdapat perbedaan yang signifikan antara kemampuan spasial siswa yang diajar melalui pembelajaran Realistic Mathematic Education (RME) dan kemampuan spasial siswa yang diajar melalui pembelajaran kooperatif tipe STAD (2) terdapat interaksi antara pembelajaran dan kemampuan awal matematika siswa terhadap kemampuan spasial siswa. Kata Kunci: Realistic Mathematic Education (RME), KemampuanAwalMatematik (KAM), Student Teams Achievement Division (STAD), Spasial, ANAVA INTRODUCTION Mathematics is an applied science that can be applied in various forms. Almost all human activities are related to mathematics (Fitri, Syahputra, & Syahputra, 2019; Kulsum, Hidayat, Wijaya, & Kumala, 2019; Wijaya, Purnama, & Tanuwijaya, 2020). In addition, mathematics is one of the most preferred fields of study during the teaching and learning process in schools (Desania, Sinaga, Lubis,