Islamic Religious Education (PAI) learning on the topic of purification plays an important role as a basis for carrying out worship. However, the reality in the field shows that students' understanding of the material on purification is still low and learning tends to be teacher-centered. This study aims to develop PAI teaching materials based on Student Worksheets (LKS) and test their effectiveness in improving the understanding of seventh-grade students on purification at SMP NU Roudlotut Thohirin Bantur. The method used is research and development (R&D) with a 4-D model that includes the stages of definition, design, development, and dissemination. The research subjects were seventh-grade students and PAI teachers. Data collection techniques included observation, interviews, questionnaires, and learning outcome tests. The results of the study showed that the developed LKS-based teaching materials were declared feasible by material experts and media experts and were effective in improving student understanding, as indicated by the increase in student learning outcomes after using LKS. Thus, LKS-based PAI teaching materials can be used as an effective and applicable learning alternative for purification material.
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