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As the study of mathematics is quite vast, the lecturer requires open interactive materials so that students can better understand, especially in the process of solving problems in learning mathematics. This can be overcome by improving learning materials supporting students problem-solving abilities, one of which is using an e-module. This research aims to determine the validity, practicality, and effectiveness of e-modules for applied mathematics courses for students. This research used a 4D development model. The development procedure in this research consists of 4 stages namely define, design, develop, and disseminate. This research uses several collection instruments, namely validation sheets, lecturer response questionnaires, student response questionnaires, lecturers’ ability observation sheets in managing learning, student activity observation sheets, and student achievement test. The research results show that the validity of the e-module shows a score of 4.8 which is in the very valid category. The lecturer response questionnaire showed a score of 95% and the student response questionnaire showed a score of 94.5% so it was in the very positive category. The lecturer’s ability sheet in managing learning is at a score of 4.85, the student activity sheet shows a score of 80.2% and the learning achievement test is 93%. So, it can be concluded that the e-module is valid, practical, and effective. Keywords: valid, practical, effective
Halik et al. (Thu,) studied this question.