The development of this Google Sites-based interactive multimedia was motivated by the need for innovation in mathematics learning media that supports a student learning process that is engaging, interactive, and easily accessible. Observations in class X-2 and interviews with the mathematics teacher at SMA Negeri 2 Pekalongan revealed that instruction was conducted through a mix of online and offline modes. During mathematics lessons, some students struggled to grasp basic mathematical concepts, lacked the motivation to attempt problems independently, and tended to rely on Artificial Intelligence (AI) to complete assignments. Addressing these issues, this study aimed to develop a valid and practical Google Sites-based interactive multimedia tool to foster mathematical concept understanding among Grade X students at SMA Negeri 2 Pekalongan. The study employed the Research and Development (R&D) method using the ADDIE model (Analysis, Design, Development, Implementation, Evaluation). The results indicated that the Google Sites-based interactive multimedia was highly valid, with a validity score of 91.339%, and highly practical, with a practicality score of 83.855%. Based on these findings, it can be concluded that Google Sites is suitable for use as a mathematics learning medium to develop students' understanding of mathematical concepts.
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