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This study aims to develop LKS based Problem Based Learning (LKS) on the set material. This type of research is research development or Research and Development (R&D). This study follows the steps of the ADDIE development: analysis, develompment, implementation and evaluation. The subject of this research is the students of class VII A SMPN 10 Muara Bungo. Research instruments on this development are questionnaires and questions. The questionnaire consisted of a validation sheet by 3 experts, materials experts, design experts, and media experts as well as individualized questionnaires, small group trials and field trials. After the LKS was developed, the LKS was validated by 3 validators. The percentage of results obtained after validation is: for the material expert's assessment of 81.8% with the category "very valid", the design expert of 77.8% with the category "valid" and 87.7% media experts with the category "very valid. Then the LKS in the test try, the percentage of test results obtained are: individual test of 82.5% with the category of "very practical", small group testing of 89.7% with the category "very practical" and field trials of 83,7% with very practical category. Furthermore, to assess the effectiveness of LKS seen from the results of pre-test and post-test conducted by students, then calculated using the calculation of t-test statistics, obtained tcount of 9.24 and ttable of 2.03, because tcount larger ttable it can be concluded that the LKS developed effectively.

PENGEMBANGAN LEMBAR KERJA (LKS) BERBASIS PROBLEM BASED LEARNING (PBL) PADA MATERI HIMPUNAN SISWA KELAS VII SMP N 10 MUARA BUNGO