Development of Student Worksheets-PBL Improve Students Critical Thinking Ability

—This study aims to: (1) produce a problem based learning based worksheet that is suitable for thematic learning in grade 5 of elementary school; (2) knowing the students critical thinking skills by applying the participants worksheets in the class. his student worksheet is compiled using the 4D model of Research & Development. Data retrieval research was conducted at SDN 101877 Tanjung Morawa. The research phase is define, design, develop, and Disseminate. The level of feasibility of student worksheets is obtained from expert validators and practitioner validators analyzed. After being validated and revised, the product is tested on a limited basis on students. The results of the trials were then analyzed to determine the feasibility of the worksheet of students from the perspective of students. Extensive tests are conducted after making improvements from the results of limited trials. The final results of the extensive test in the form of pretest and posttest values were then analyzed and obtained a standard gain value of 0.87 in the high category