Edcomtech Submited 03-05-2020 Accepted 12-05-2020 Corresponding Author Sit Munawaroh munawarohamel@gmail.com Pengembangan Bahan Ajar Matematika Materi Bilangan berbasis Higher Order Thinking Skills (HOTS) Siti Munawaroh 1 , I Nyoman Sudana Degeng 2 , Nurmida Catherine Sitompul 3 1,3 Teknologi Pendidikan, Pascasarjana, Universitas PGRI Adi Buana Surabaya 1 Guru Matematika SMP Negeri 20 Surabaya, 2 Teknologi Pendidikan Universitas Negeri Malang Abstrak Pengembangan Bahan ajar Matematka Materi Bilangan Berbasis High Order Thinking Skills (HOTS) untuk siswa SMP dimaksudkan untuk memberikan salah satu jawaban terhadap kurangnya buku pendamping pembelajaran Matematka materi bilangan yang mengimplementasi kurikulum 2013 serta keterbatasan guru dalam mengembangkan strategi pembelajaran berorientasi HOTS dan adanya tuntutan untuk peserta didik yang selalu membiasakan diri berpikir krits,analits, memecahkan masalah dan meningkatkan kreatvitas. Penelitan ini menggunakan metodologi penelitan Research and Development (R&D) dimana penelit membatasi penelitan dalam skala kecil, termasuk untuk membatasi langkah penelitan. Hasil validasi diperoleh bahwa secara keseluruhan ahli desain memberi skor rata-rata 4,7. Ahli media memberi skor rata rata 4,7. Guru matematka memberi skor rata rata 3,84 dan angket respon siswa (Uji kelompok kecil) mendapat skor 4,5 berdasarkan data dan analisis yang dilakukan menyatakan produk bahan ajar ini sangat layak digunakan sebagai buku pendamping pembelajaran Matematka berbasis HOTS Kata Kunci: pengembangan bahan ajar, Higher Order Thinking Skills, Pembelajaran matematka Abstract Development of Mathematcs Teaching Materials for Numbers Based on High Order Thinking Skills (HOTS) for junior high school students is intended to provide one answer to the lack of a companion Mathematcs learning companion number material that implements the 2013 curriculum and the limitatons of teachers in developing HOTS-oriented learning strategies and the existence of demands for students who always accustom themselves to think critcally, analytcally, solve problems and increase creatvity. This research uses Research and Development (R&D) research methodology where researchers limit research on a small scale, including to limit the research steps. Validaton results obtained that overall design experts gave an average score of 4.7. Media experts score an average of 4.7. Mathematcs teachers gave an average score of 3.84 and the student response questonnaire (small group test) received a score of 4.5 based on the data and analysis conducted which stated that this teaching material product was very suitable to be used as a companion book for HOTS-based Mathematcs learning. Keywords: Development of teaching materials, Higher Order Thinking Skills, Mathematcs learning Jurnal Kajian Teknologi Pendidikan Volume 6, No 1, April 2021 124-139 pISSN: 2548-9879 eISSN: 2599-2139 124