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This study aims to produce a student's book characterized by the Indonesian Realistic Mathematics Education Approach on fractional arithmetic operations material for grade V Elementary School that is valid, practical, and effective. This Research and Development uses the ADDIE development model (Analysis, Design, Development, Implementation, Evaluation). The analysis phase consists of an analysis of student needs and curriculum analysis. At the design stage, namely the preparation of a map of student book needs, determining the structure of student books and making research instruments. At the development stage, namely preparing student books and validating student books to experts. The implementation phase includes teaching experiments to 3 students (one on one), small groups (small groups) and field tests. Then, at the evaluation stage includes the assessment of student books with teachers and students. This study uses the Indonesian Realistic Mathematics Approachin the matter of fractional arithmetic operations. The results showed that the average percentage of student book validity according to experts was 79.4% with the assessment criteria being valid or could be used with revisions. Meanwhile, the average percentage of practicality of student books according to students is 75.7% with the assessment criteria being practical or can be used with revisions. Meanwhile, the average percentage of the effectiveness of student books according to students is 77.5% with the assessment criteria being effective in supporting students' mathematical problem solving abilities.

Abstract: This research and development was aimed to produce teacing materials supporting the process of learning mathematics based on Indonesian realistic mathematics education (PMRI) to support the mathematical problem solving skills of fraction counting operations that meet valid and practical criteria. This research and development uses Plomp Model which three steps namely (1) preliminary research, (2) prototype phase, (3) assessment. The results show that the validity test results of teaching materials have met the valid criteria with a percentage of 83.7%. Meanwhile, the practical test results of teaching materials meet very practical criteria with a percentage of 90.2%. Abstrak: Tujuan dari penelitian dan pengembangan ini untuk menghasilkan bahan ajar sebagai pendukung proses pembelajaran matematika berbasis Pendidikan Matematika Realistik Indonesia (PMRI) untuk mendukung kemampuan pemecahan masalah operasi hitung pecahan yang valid dan praktis. Model pengembangan yang digunakan adalah Plomp yang terdiri atas tiga langkah, yakni (1) tahap penelitian awal (preliminary research), (2) tahap pengembangan protitipe (prototipye phase), dan (3) tahap penilaiain (assessment phase). Hasil penelitian dan pengembangan menunjukkan bahwa hasil uji kevalidan bahan ajar telah memenuhi kriteria valid dengan persentase sebesar 83,7%. Hasil uji kepraktisan bahan ajar memenuhi kriteria sangat praktis dengan persentase sebesar 90,2%.