The objective of this research was to develop RME (Realistic Mathematics Education) teaching materials. It aimed to produce teaching materials as supporting media for independent, active, creative, effective, and enjoyable learning in understanding mathematics concepts. The research developed students’ learning process skills in mathematics education. The researcher employed Research and Development (R&D) with the ADDIE model. The subjects in the development of the Realistic Mathematics Education (RME) teaching materials included media experts, material experts, and teachers from MIS Sholihin, Tanjung Morawa. The object of this research was the teaching materials. The verification results from the reviewer, a media expert, indicated that the feasibility of the Realistic Mathematics Education (RME) book for mathematics with fraction material for fourth-grade students scored “4.4,” which fell into the “good” category. The result obtained from the media expert was “4.4,” categorized as “good.” The material experts also provided a score of “3.17,” categorized as "fairly good.” Finally, the teacher’s feedback yielded a score of “4.0,” categorized as “good.” Data analysis revealed that the average score was “4.19,” categorized as “good.” Therefore, it could be concluded that the Realistic Mathematics Education (RME) teaching materials for mathematics on fraction material for fourth-grade students were suitable for use
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