<![CDATA[One of the main problems in learning mathematics is the low conceptual understanding of students, which is reflected in the low category of the pretest results. Innovative approaches such as Realistic Mathematics Education (RME) through RME-based Student Worksheets are needed to overcome this. This study aims to test the effectiveness of RME-based Student Worksheets in improving the understanding of mathematical concepts. The method used is developmental research with the ADDIE model (Analysis, Design, Development, Implementation, Evaluation). The research subjects included validation by two subject matter experts, two media experts, two language experts, and one teacher, and trials on 25 students in grade V of SDN 2 Sawah Brebes. The validation results showed scores of 0.7465 (subject matter expert), 0.8381 (media expert), and 0.7986 (language expert), which were considered valid. The statistical analysis of the paired sample t-test produced a significance value of 0.000 (<0.05), thus rejecting Ho and accepting Ha. This proves a significant increase between the pretest and posttest scores, indicating that the RME-based Student Worksheet effectively improves students' understanding of concepts. The researcher recommends using the RME model to implement the stage of understanding contextual problems. Scaffolding is needed for students because of the diverse zone of proximal development (ZPD).]]>
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