<![CDATA[The lack of instructional media that stimulate students' critical thinking skills has resulted in low learning outcomes. This study aims to analyze the effectiveness of scientific approach-based student worksheets (LKPD) on the topic of light and its properties in improving the learning outcomes of fifth-grade elementary students. This research employed a development design using the ADDIE model (Analyze, Design, Development, Implementation, Evaluation). The subjects of the study were 14 fifth-grade students. Data collection methods included observation, interviews, and questionnaires, with instruments such as questionnaire sheets and multiple-choice tests. Data analysis techniques involved qualitative descriptive analysis, quantitative descriptive analysis, and inferential statistical analysis using the t-test. The findings revealed that the effectiveness test of the scientific approach-based LKPD yielded a significant result (2-tailed) of 0.000, indicating that H0 was rejected and H1 was accepted. This concludes that there is a significant difference in learning outcomes before and after using the scientific approach-based LKPD, particularly on the topic of light and its properties. The innovation of LKPD with a scientific approach to the material of light and its properties has implications as an example for teachers in implementing learning based on a scientific approach in elementary schools.]]>
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