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This study aims at developing 4D model into 3D following define, design, and development phase. E-module with RME approach is firstly validated by media expert, material expert and also questionnaire of student response. It obtained a score of 85.2% from a material expert, 89.2% from media expert validation 89.2%, and 85.2% from students’ response, hence, E-modules developed deserve to be utilized with the very good category. In addition, the experiment class’ learning outcomes are better than control classes. Therefore, E-module development with RME approach is feasible and can be used in elementary mathematics learning particularly in Geometry learning. Keywords: development, e-module, RME, elementary school Abstrak: Penelitian ini bertujuan untuk mengembangan model 4D menjadi 3D dengan tahap define (pendefinisian), design (perencanaan), dan development (pengembangan). E-modul dengan pendekatan PMR terlebih dahulu dilakukan uji validasi oleh ahli media, ahli materi dan juga angket tanggapan siswa. Diperoleh rata-rata penilaian validasi ahli materi 85,2%, validasi ahli media 89,2%, penilaian tanggapan siswa 85,2%, Jadi media E-modul layak digunakan dengan kategori sangat baik. Hasil belajar kelas eksperimen lebih baik dari kelas kontrol. Jadi pengembangan E-modul dengan pendekatan PMR layak dan dapat digunakan dalam pembelajaran matematika SD khususnya geometri. Kata Kunci: pengembangan, e-modul, PMR, Sekolah Dasar

PENGEMBANGAN E-MODUL GEOMETRI DENGAN PENDEKATAN MATEMATIKA REALISTIK DI SEKOLAH DASAR