This research aims to develop students' worksheets based on inquiry integrated by Youtube Video. This is Research and Development (R&D) with the ADDIE model where 50 active students from the Faculty of Teacher Training and Education of Universitas Syiah Kuala involved at the implementation stage. The results showed that the average percentage of students' worksheets validated by the 3 validators was 92% could be categorized as very valid to be used. Questionnaire results showed 92% of students agree that the students' worksheets developed help with learning during COVID-19, 98% agree the students' worksheets help students to study independently, and 96% agree that they easily understand the material presented. Based on the results of validation and students' questionnaire response, it can be concluded that the students' worksheets based on inquiry integrated by youtube videos are feasible to be used the alternative of teaching materials for online learning during the COVID-19 pandemic
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