<![CDATA[This study aimed to develop valid and practical circle materials based on a realistic mathematics education approach to facilitate the mathematical understanding ability of eighth-grade students of SMP/MTs. This research and development used the ADDIE development model covering the Analysis, Design, Development, Implementation, and Evaluation stages. The subjects of the small group trial were 6 eighth-grade students of SMPN 21 Pekanbaru. The data were collected using a validity sheet for validity and a questionnaire for practicality. Based on the results of the analysis of the obtained data, the average validity reached 85.5 with a very valid category and average practicality of 93.45 with a very practical category. Therefore, it can be concluded that the developed materials are valid and practical. Keywords: circle material; mathematics teaching materials; realistic mathematics education approach; mathematical understanding ability DOI: http://dx.doi.org/10.23960/mtk/v9i4.pp373-385]]>
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