Developing an RME-Based Mathematics Pocket Book to Support 2D Geometry Learning in Elementary Schools

Linda Astriani

Abstract


This research was motivated by the limited availability of dedicated mathematics pocket books at the elementary school level. This study aimed to develop a valid and practical mathematics pocket book focused on two-dimensional (2D) shapes based on the Realistic Mathematics Education (RME) approach. Using the Research and Development (R&D) method with the ADDIE framework (Analysis, Design, Development, Implementation, and Evaluation), the study involved fifth-grade students at Elementary School, South Jakarta, during the even semester of the 2024/2025 academic year. Expert validation confirmed high validity: linguistic validity (98%), media validity (84%), and instructional material validity (92%), all categorized as "very valid." Furthermore, practicality trials involving teachers and students yielded high practicality scores: 96.66% from teachers, 93.33% from a small group trial ( ), and 94.75% from a large group trial ( ), all falling into the "very practical" category. These findings demonstrate that the RME-based pocket book developed through the ADDIE model is highly valid and practical as a supplementary learning medium for fifth-grade mathematics instruction.

Keywords


2D Shapes; Mathematics Education; Pocket Book; Realistic Mathematics Education (RME); ADDIE Model.

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References


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