This study aims to reveal the improvement of the students' learning activities, responses, and mathematical creative thinking skills (MCTS) through open-inquiry approach (OIA). Other relevant studies in mathematics learning tend to focus on guided inquiry, and especially in Indonesia, OIA is still less applied. This study is conducted at State Junior High School in Indonesia. The method used in this study is Classroom Action Research (CAR) consists of four stages: planning, acting, observing, and reflecting. Data is collected through observation, journal reviews, interview, and test. The result of the study shows that the implementation of OIA enhances the students' MCTS. It is shown by the improvement of the average of students' score from 73.05 in the first cycle to 78.95 in the second cycle. The increasing of MCTS includes some aspects: fluency, flexibility, and originality. The result also shows that in general, the students give positive response and engage well in learning activities with OIA. It can be concluded that the implementation of OIA enhances learning activities, gives positive response towards mathematics, and improves students' creative thinking skills.
AbstrakTujuan penelitian ini adalah untuk mengungkapkan peningkatan aktivitas, respon, dan kemampuan berpikir kreatif matematis siswa melalui pendekatan open-inquiry (POI). Penelitian sebelumnya dalam pembelajaran matematika, cenderung fokus kepada guide inquiry, khususnya untuk konteks Indonesia pendekatan open-inquiry, masih sedikit digunakan. Penelitian ini dilakukan di salah satu Sekolah Menengah di Indonesia. Metode yang digunakan adalah Penelitian Tindakan Kelas (PTK) berisi empat tahap, yaitu: perencanaan, pelaksanaan, observasi, dan refleksi. Data dikumpulkan melalui observasi, journals, wawancara, dan test. Hasil penelitian mengungkapkan bahwa penggunaan POI dapat meningkatkan kemampuan berpikir kreatif matematis (KBKM) siswa. Hal ini ditunjukkan oleh rata-rata peningkatan siswa dari 73,05 pada siklus pertama ke 78,89 siklus kedua. Peningkatan KBKM tersebut meliputi aspek fluency, flexibility, and originality. Selain itu, hasil penelitian juga menunjukkan bahwa pada umumnya siswa mempunyai respon positif dan aktivitas dalam kategori baik terhadap pelaksanaan POI. Kesimpulan penelitian ini adalah penggunaan POI dapat meningkatkan aktivitas belajar matematika siswa, memberi sikap positif terhadap mathematika dan meningkatkan KBKM siswa.Creative thinking is one of the fundamental capabilities which is possessed by the learners in the era of information and technology which is developing rapidly at present time. Educational institution as a conducive space to position the learners as a subject educational system to foster creative behavior, positive attitude and excellent character. Mathematics at school is a means to educate the students to become creative human. This is in accordance with the purpose of studying mathematics is to train and foster students how to think systematically, logical, creative, critic, consistent, developing a neve...