Kemampuan aritmetika sosial siswa pada mata pelajaran matematika yang masih rendah dibutuhkan tindakan dalam pembelajaran dikelas. Salah satunya dengan melakukan pembelajaran melalui pendekatan Science, Technology, Engineering, Mathematics (STEM). Penelitian ini bertujuan untuk mendeskripsikan peningkatan hasil belajar siswa pada materi aritmetika sosial melalui pendekatan Science, Technology, Engineering, Mathematics (STEM). Metode penelitian tindakan kelas yang dilaksanakan sebanyak 2 (dua) siklus digunakan dalam penelitian ini, dikarenakan untuk melihat peningkatan kemampuan aritmatika sosial siswa. Subjek dalam penelitian ini berjumlah 41 siswa kelas VII yang sedang mempelajari materi aritmatika sosial. Kegiatan pembelajaran dirancang melalui pendekatan STEM melalui tugas proyek yaitu membuat tape singkong dan keripik pisang/singkong. Pengumpulan data pada penelitian ini dilakukan melalui tes tertulis untuk penilaian pengetahuan, sedangkan untuk penilaian keterampilan dilihat dari persiapan sampai laporan akhir tugas proyek yang diberikan. Data dianalisis secara deskriptif kuantitatif untuk tes dan deskriptif kualitatif untuk observasi. Hasil penelitian menunjukkan bahwa pendekatan STEM benar-benar membantu siswa dalam memahami materi aritmetika sosial yang dapat dilihat dari peningkatan hasil belajar yang diperoleh dari subjek penelitian.The social arithmetic skill of students in mathematics is still poor required practice in-class learning. One of them provides learning through STEM approach (Science, Technology, Engineering, and Mathematics). This research leads to describe the improvement of students’ learning outcomes in social arithmetic material through the STEM approach. The classroom action research method carried out in two cycles was used in this study due to an improvement in students’ social arithmetic skills. The subjects in this study were 41 students of grade VII who was studying social arithmetic material. Learning activities were designed through the STEM approach by giving project tasks in making fermented cassava and banana chips. Data collection in this study was conducted through a written test for cognitive assessment, while for the affective evaluation seen from the preparation until the final project assignments report. The data analysis of the test was measured using descriptive quantitative and the data observation was evaluated using descriptive qualitative. The findings show that the STEM approach allows students to grasp the social arithmetic material that can be seen from better learning outcomes from the research subjects
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