<![CDATA[The purpose of this study is to determine the characteristics, describe the eligibility level, ascertain the user responses, and determine the effectiveness of The Development of Guided Inquiry-Based Student Worksheets (LKPD) Using Manipulative Media to Improve Understanding on Mathematical Concept of GCD (FPB) Subject Matter in Grade V Elementary School. This study applied Research and Development (R&D) design. The development model used in this study are the ADDIE model. The types of data collected are quantitative and qualitative, using research instruments such as interviews, necessity analysis questionnaires, test paper, expert validation paper, and user response questionnaires. Based on the research results, it can be concluded that the student worksheets (LKPD) that has been developed is suitable to use as teaching material in the Mathematics study for class V. The expert validation results as such; 0.86 validation score from material experts, 0.83 from language experts, and 0.83 from design experts. User responses were very good, indicated by the results of the homeroom teacher questionnaire analysis which showed a percentage of 98.5% with a positive criteria. Meanwhile, the student responses obtained a percentage of 86.11% with a positive criteria. The developed student worksheets (LKPD) was effective in improving students’ Mathematical conceptual understanding on GCD (FPB) subject matter in grade V at SD Negeri 5 Bengkulu City. This is supported by the result of the average N-Gain score of 0.595 for students who used the student worksheets (LKPD). It means that there is a significant difference between the pre-test and post-test learning outcomes based on student tests.]]>
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