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The research aims to develop online science teaching instruments based on a scientific approach using a proper PhET simulation to improve learning outcomes for elementary school students. The developed equipment is the lesson plan, students' activity sheet, learning materials, and assessment sheet of learning outcomes. The research plan is designed in One Group Pre-Test- Post-Test Design. The population in this study is all students of the fifth grade of State Elementary School Jagir I academicdoi:10.46245/ijorer.v1i2.40 fatcat:aozr4v53t5ae3m5xb27awtkinu