This research aims to analyze integration of critical thinking skills in science learning using a blended learning system in elementary schools during covid-19 pandemic. Research case study qualitative with descriptive percentages. Collected data: observation, interviews, documentation, and questionnaire. Validity data: source and techniques triangulation. Data analysis techniques using Miles & Huberman: collection, reduction, presentation, and conclusions. The results of the research integration critical thinking skills in science learning using blended learning system low with (Mo
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