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This research investigates the development and testing of an interactive e-module based on inquiry learning, designed to improve students’ understanding of derivatives in calculus. The study adopts a Research and Development (R&D) approach, which involves several stages: design, prototype creation, testing, and revision. The e-module incorporates interactive exercises, real-time feedback, and multimedia elements to engage students in active learning. A pre- and post-test assessment was conducted to measure the effectiveness of the e-module, revealing a 20% improvement in students’ conceptual understanding of derivatives. Feedback from students indicated that the e-module’s interactive features, including visual representations, problem-solving activities, and immediate corrections, significantly enhanced their learning experience. The results were compared with traditional printed materials, showing that the interactive e-module was more effective in improving students' problem-solving skills and overall understanding of abstract concepts in calculus. The findings suggest that technology-enhanced tools, such as interactive e-modules, offer a promising approach to calculus education, fostering deeper engagement and providing immediate feedback, which traditional methods fail to offer. These tools are particularly beneficial in bridging the gap between theoretical understanding and practical application in higher education. The study also recommends expanding the use of inquiry-based learning and interactive modules to other areas of mathematics and STEM education. Future research should focus on refining the e-module to include more personalized learning pathways and explore its long-term effects on students' performance across various subjects.

The world of education in the 21st century faces formidable challenges, especially in the fields of science and technology which are very rapid. Changes in world society and our own society in the socio-cultural field and the growing issue that the quality of education is low. Therefore, to face these challenges, education and learning requires changes in both quantity and quality. Various efforts have been made in the field of education. Teachers as direct executors of achieving learning objectives need to improve the quality of the learning process by paying attention to how to convey the knowledge they have to their students. The discovery method in learning mathematics is intended to encourage students to understand something that is factual or mathematical relations that are still new to students, for example certain patterns, characteristics or formulas. After finding facts/relations students are asked to draw a generation from what they find. The Inquiry method is a method that can lead students to realize what they have learned while studying. Inquiry places students as active learning subjects. So learning mathematics using the discovery method (inquiry) can increase student understanding.