IndonesiaPendahuluan:  Penelitian ini bertujuan untuk menghasilkan media pembelajaran matematika berbasis android untuk siswa SD/MI dengan melibatkan pakar pada proses pengembangan dan penilaian produknya. Metode: Penelitian ini merupakan penelitian pengembangan (Research and Development). Prosedur pengembangan menggunakan model 4D, yaitu: define (analisis pengguna, kurikulum, dan bahan ajar), design (merancang produk dengan alat dan bahan), develop (penilaian dan revisi), dan disseminate (uji coba pada calon pengguna). Instrumen penelitian ini adalah angket. Tim penilai produk terdiri: ahli, peer reviewer, guru SD/MI, dan respon siswa kelas IV SD/MI. Hasil: 1) Peneliti telah menghasilkan media pembelajaran matematika berbasis android pada materi bangun datar untuk siswa kelas IV SD/MI, 2) Penilaian ahli, peer reviewer dan guru sekolah dasar terhadap produk mendapat skor 434 dan persentase 86,67%, sangat baik,  3) tanggapan siswa kelas IV SD/ MI terhadap media pembelajaran matematika berbasis android memperoleh skor 439 dengan persentase penilaian 87,8%. Nilai tersebut berada pada interval antara setuju dan sangat setuju. EnglishIntroduction:   This study aims to produce a learning media of mathematics based on Android for Elementary School students by involving Experts in the process of development and assessment. Method: This research is a research development. Procedures of development using the 4 D model. namely: define (analysis of user, curriculum, and materials), design (designing products with tools and materials), develop (assessment and revision), and disseminate (trials on user targets). The research instrument is a questionnaire. Assessor team of product consist of expert, peer reviewer, teacher and student of elementary school. Result: 1) Researcher had been produced a learning media of mathematics based on Android on subject Geometry for elementary school student grade IV, 2) The assessment of expert, peer reviewer and teacher of elementary school to product got score 434 and percentage 86, 67%, it is very good, 3) The responses of elementary school students grade IV to learning media got score 439 with percentage of appraisal 87,8%. It is in between agree and strongly agree.