<![CDATA[This study aims to develop and examine the effectiveness of the Smart Pocket Board (Pakapin) media in improving elementary school students’ mathematical problem-solving skills on addition and subtraction topics. This research employed a Research and Development (R&D) method using the ADDIE model, consisting of analysis, design, development, implementation, and evaluation stages. The subjects were second-grade students at SDN Pekalongan II. Data were collected through tests, questionnaires, and expert validation, and analyzed using both quantitative and qualitative approaches, with effectiveness measured using the N-gain test. The results indicate that the Pakapin media achieved a feasibility level of 84.33%, categorized as feasible based on expert validation. The effectiveness test shows a significant improvement in students’ problem-solving skills, with an N-gain score of 0.71 (high category). Student and teacher responses reached 85.67% and 88%, respectively, both categorized as highly feasible. These findings suggest that Pakapin is effective in enhancing problem-solving skills through concrete and interactive learning. The study highlights the importance of manipulative media in supporting conceptual understanding and student engagement in elementary mathematics learning. Keywords: learning media ; Pakapin ; elementary mathematics ; addition and sustraction]]>
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