<![CDATA[This research aimed to develop a Quartet Card learning media on the topic of plane shapes, including triangles and quadrilaterals, for grade 5 students at SDIT Ghilmani Surabaya. The study used a Research and Development (R&D) method with the Thiagarajan 4D model, which included four stages: Define, Design, Develop, and Disseminate. The research subjects were 24 students from class V-C. Data were collected through validation sheets and student response questionnaires. The validation involved material and media experts, while the practicality test involved the students as users. The results show that the developed media obtains an average validation score of 82.28%, which is categorised as very feasible for use in learning. The students’ response results reach an average score of 73.07%, indicating that the media is practical and easy to use. These findings demonstrate that the Quartet Card learning media helps make the learning process more engaging and interactive. It also supports students in understanding the concepts of plane shapes, particularly triangles and quadrilaterals. In conclusion, the Quartet Card learning media is considered valid, practical, and suitable for use in mathematics learning for grade 5 primary school students. Keywords: learning media, math quarted card, two-dimensional shapes]]>
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