<![CDATA[This study was motivated by the need for innovative, interactive, and digitally integrated mathematics learning materials to improve the quality of instruction in elementary schools. Mathematics learning in Grade V is still predominantly conventional and provides limited opportunities for students to develop critical thinking and creativity skills. One solution to address this issue is the development of a STEAM-based (Science, Technology, Engineering, Arts, and Mathematics) teaching module delivered through the Google Sites digital platform. This approach is expected to make learning more contextual, engaging, and easily accessible for students.This research employed a Research and Development (R&D) method using the Plomp development model, which consists of three phases: preliminary research, prototyping stage, and assessment phase. The preliminary research phase involved needs analysis, curriculum analysis, analysis of students’ characteristics, and learning material analysis. The prototyping stage focused on designing and developing the STEAM-based teaching module supported by Google Sites, followed by self-evaluation and expert validation by material, media, and language experts. The assessment phase was conducted through limited trials, including practicality testing by teachers and students as well as effectiveness testing to determine the usefulness of the module in Grade V mathematics learning.The results showed that the STEAM-based teaching module supported by Google Sites achieved a very high level of validity, with validation scores of 95% for material, media, and language aspects. The module was also classified as very practical, with practicality scores of 98% in the small group trial and 97% in the field test. Furthermore, the effectiveness test yielded a score of 94%, indicating that the module is effective for use in Grade V elementary school mathematics learning. ]]>
