<![CDATA[This study aims to develop scientific-based teaching materials to improve elementary school students' mathematics learning outcomes, especially in flat geometry material in grade IV. The background of this study is based on the low mathematics learning outcomes of students caused by the assumption that mathematics is a difficult subject, the lack of interesting teaching materials, and the lack of a scientific approach in the learning process. The type of research used is research and development (Research and Development) with a 4D model consisting of the Define, Design, Development, and Dissemination stages. The subjects of this study were 20 fourth-grade students of Kasih Ibu Private Elementary School, Medan. Data collection instruments consisted of observation, interviews, expert validation questionnaires, and learning outcome tests. The validation results showed that the developed teaching materials were included in the categories of "very feasible" and "very effective" in improving mathematics learning outcomes. Thus, these scientific-based teaching materials can be used as an alternative learning resource that is interactive and relevant to students' needs in understanding mathematical concepts]]>
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