ABSTRAK
Penelitian ini bertujuan untuk mengetahui: 1) perbedaan pengaruh yang signifikan antara  model pembelajaran kooperatif tipe Group Investigation dengan model pembelajaran tipe Think Pair Share terhadap prestasi belajar matematika siswa Sekolah Dasar di Gugus XVII Sultan Agung Kecamatan Banjarsari Kota Surakarta, 2) perbedaan pengaruh yang signifikan antara siswa yang memiliki motivasi belajar tinggi dan rendah terhadap prestasi belajar matematika pada siswa Sekolah Dasar di Gugus XVIII Sultan Agung Kecamatan Banjarsari Kota Surakarta, 3) interaksi pengaruh yang signifikan antara model pembelajaran dengan motivasi belajar siswa terhadap prestasi belajar matematika pada siswa Sekolah Dasar di Gugus XVIII Sultan Agung Kecamatan Banjarsari Kota Surakarta.
Penelitian ini menggunakan metode eksperimental, dimana penelitian dilakukan di SDN Nusukan Barat No 113 dan SDN Sumber V Surakarta.Populasi penelitian ini adalah semua siswa Sekolah Dasar Gugus XVIII Sultan Agung Kecamatan Banjarsari Kota Surakarta. Teknik sampling yang digunakan adalah cluster random sampling. Teknik pengumpulan data menggunakan metode tes dan non tes, yaitu tes prestasi belajar matematika dan angket motivasi belajar. Teknik analisis data menggunakan Analisis Variansi Dua Jalan, dengan uji prasyarat menggunakan uji normalitas dan uji hogenitas dengan taraf signifikan 0,05.
Berdasarkan hasil penelitian dapat disimpulkan: 1) terdapat perbedaan pengaruh yang signifikan antara  model pembelajaran kooperatif tipe Group Investigation dengan model pembelajaran tipe Think Pair Share terhadap prestasi belajar matematika siswa Sekolah Dasar di Gugus XVII Sultan Agung Kecamatan Banjarsari Kota Surakarta (F0 = 8,313; p<0,05); 2) terdapat perbedaan pengaruh yang signifikan antara siswa yang memiliki motivasi belajar tinggi dan rendah terhadap prestasi belajar matematika pada siswa Sekolah Dasar di Gugus XVIII Sultan Agung Kecamatan Banjarsari Kota Surakarta(F0 = 77,654; p<0,05); 3) terdapat interaksi pengaruh yang signifikan antara model pembelajaran dengan motivasi belajar siswa terhadap prestasi belajar matematika pada siswa Sekolah Dasar di Gugus XVIII Sultan Agung Kecamatan Banjarsari Kota Surakarta (F0 = 4,439; p<0,05).
Kata kunci: model pembelajaran, group investigation, think pair share, motivasi belajar, prestasi belajar matematika
ABSTRACT
The objectives of this research are to identify: (1) the significant difference of effect between the cooperative learning model of the Group Investigation (GI) type and that of the Think Pair Share (TPS) type on the learning achievement in Mathematics of the students of Primary School Cluster XVII Sultan Agung of Banjarsari sub-district, Surakarta city; (2) the significant difference of effect between the high learning motivation and the low learning motivation on the learning achievement in Mathematics of the students of Primary School Cluster XVII Sultan Agung of Banjarsari sub-district, Surakarta city; and (3) the significant interaction of effect between the cooperative learning models and the learning motivations on the learning achievement in Mathematics of the students of Primary School Cluster XVII Sultan Agung of Banjarsari sub-district, Surakarta city.
This research used the experimental method and was conducted at State Primary School of Nusukan Barat No. 113 and at State Primary School Sumber V of Surakarta. Its population was all of students of Primary Schools Cluster XVII Sultan Agung of Banjarsari sub-district, Surakarta city. The samples of research were taken by using the cluster random sampling technique. The data of research were collected through test and non test methods, namely: test of learning achievement in Mathematics and questionnaire of learning motivation. They were analyzed by using the two-way analysis of variance with the prerequisite tests of normality test and homogeneity test at the significance level of 0.05.
The results of the research show that: (1) there is significant difference of effect between the cooperative learning model of the GI type and that of the TPS type on the learning achievement in Mathematics of the students of Primary School Cluster XVII Sultan Agung of Banjarsari sub-district, Surakarta city(F0 = 8,313; p<0,05); (2) there wasa significant difference of effect between the high learning motivation and the low learning motivation on the learning achievement in Mathematics of the students of Primary School Cluster XVII Sultan Agung of Banjarsari sub-district, Surakarta city(F0 = 77,654; p<0,05); and (3) there is a significant interaction of effect between the cooperative learning models and the learning motivations on the learning achievement in Mathematics of the students of Primary School Cluster XVII Sultan Agung of Banjarsari sub-district, Surakarta city (F0 = 4,439; p<0,05).
Keywords:    Learning model, Group Investigation, Think Pair Share, learning motivation, mathematics learning achievement.