<![CDATA[This study aims to develop a Fun Thinkers Book learning media based on numeracy literacy for teaching arithmetic operations with whole numbers to third-grade students, in order to improve their problem-solving skills. The research used a development method with the ADDIE model, which consists of five stages: Analyze, Design, Development, Implementation, and Evaluation. The subjects of this study were third-grade students at SDN Ponggok 04, Blitar Regency. The data collection tools used were interviews, observations, questionnaires, and tests. The data analysis techniques applied were both qualitative and quantitative descriptive analysis. The results of the study indicate that the Fun Thinkers Book developed is valid and suitable for use as learning media. The use of the Fun Thinkers Book proved effective in improving problem-solving abilities among the third-grade students at SDN Ponggok 04, Blitar Regency, as evidenced by the improvement in average pretest scores from 57.2 to posttest scores of 90.0, with an N-Gain of 0.767.]]>
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