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Creativity is the result of a creative thinking process. Creative thinking refers to higher-order thinking processes, this skill is indispensable in the 4.0 revolution era because of the complexity in all aspects of modern life. One of the learning models that can facilitate students in developing their creative thinking skills is Problem Based Learning and the use of printed teaching materials, namely Student Worksheets. The research objective is to produce LKPD based on Problem Based Learning to improve the creative thinking skills of students in class XI SMA. This type of research is development research using the Plomp model. The Plomp model development phase consists of a primary research phase, a development or prototyping phase, and an assessment phase. The instruments used are validity assessment sheets, practicality assessment sheets and essay questions to assess their effectiveness. The results showed that the LKPD based on Problem Based Larning was very valid with a value of 83.25% based on the validation carried out by the validator. The results of the practicality assessment by the teacher showed a value of 94.17% with very practical criteria and the results of the practicality assessment by students getting a score of 87.52% with very practical criteria. The results of the effectiveness test showed that based on the N-Gain Score test conducted in the experimental class, the score was 0.71 in the high category, while the control class scored 0.48 in the medium category, while based on the hypothesis test, it was found that the use of problem-based worksheets was Based Learning is effective in improving students' creative thinking skills. So it can be concluded that the Problem Based Learning-based worksheets that have been developed are very valid, very practical, and effective..

Development of Student Worksheets Based on Problem Based Learning to Improve Creative Thinking Skills of Class XI High School Students