Penelitian ini bertujuan untuk menguji kevalidan dan kelayakan model pembelajaran kooperatif tipe Group Detective Learningpada pembelajaran Matematika kelas V SDN Nusadadi, dan MI Tarbiyatul Athfal Nusadadi.Siswa mengalami kesulitan dalammemahami soal cerita terkait materi pecahan, perbandingan dan skala karena guru menggunakan model pembelajaran yang kurang menarik. Rumusan masalah dalam penelitian ini adalah apakah model pembelajaran kooperatif tipe Group Detective Learningvalid dan layak dikembangkan pada pembelajaran Matematika kelas V Sekolah Dasar?Jenis penelitian yang digunakan adalah penelitian dan pengembangan atau Research and Development (R&D). Pengembangan model pembelajaran kooperatif tipe Group Detective Learning menggunakan model pengembangan ASSURE.Hasil penilaian rata-rata validasi ahli materi dan ahli model pembelajaran adalah 78,95 % dengan kategori “Layak”. Hasil perhitungan rata-rata uji kelayakan angket respon guru adalah 83,75 % dengan kategori “Sangat Layak”. Hasil perhitungan rata-rata uji kelayakan angket respon siswa adalah 92,62 % dengan kategori “Sangat Layak”. Hal ini menunjukkan bahwa pengembanganmodel pembelajaran kooperatif tipe Group Detective Learningpada pembelajaran Matematika kelas V teruji valid dan layak untuk digunakan dalam proses pembelajaran.

Kata Kunci: Model Group Detective Learning, Matematika, Sekolah Dasar

Abstract: This study aims to examine the prevalence and feasibility of cooperativelearning model of Group Detective Learning type in the learning of V grade Mathematics SDN Nusadadi, and MI TarbiyatulAthfalNusadadi. Students have difficulties in understanding the story related to fractional material, comparison and scale because the teacher uses less interesting learning model. The formulation of the problem in this research is whether the cooperative learning model of Group Detective Learning type is valid and feasible to be developed in the learning of V grade V elementary school? The type of research used is research and development or Research and Development (R & D). The development of cooperative learning model of Group Detective Learning type using ASSURE development model. The result of the average validation of material experts and expert model of learning is 78.95% with the category of "Eligible". The result of the average test feasibility test questionnaire teacher response is 83.75% with the category "Very Eligible". The results of the calculation of the average test of questionability questionnaire responsiveness of students is 92.62% with the category "Very Eligible". This shows that the development of cooperative learning model of Group Detective Learning type in V class test is valid and feasible to be used in learning process.

Keywords: Group Detective Learning Model, Mathematics, Elementary School