<![CDATA[The purpose of this study was to determine the effect LKS of PBL based to the student critical thinking skills. The study design was a pretest-posttest non-equivalent. The samples in this study were students of class VIID and VIIE randomly selected by random sampling technique clusster. Data of the research were qualitative and quantitative. The qualitative data was gotten by students learning activity, the quantitative data were the average score of test, that was analyzed by t-test and U-test. The result showed that the students learning activity improve with an average of 71,79 which is in good criteria. The students learning outcomes also develop, with N-gain average score was 62,55. Thus, the application of the model PBL influential in improving critical thinking skills by students. Penelitian ini bertujuan untuk mengetahui efektivitas LKS Berbasis PBL terhadap keterampilan berfikir kritis siswa. Desain penelitian adalah pretes-postes tak ekuivalen. Sampel penelitian adalah siswa kelas VIID dan VIIE yang dipilih secara teknik clusster random sampling. Data penelitian berupa data kualitatif dan kuantitatif. Data kualitatif berupa aktivitas belajar siswa, data kuantitatif diperoleh dari rata-rata nilai tes yang dianalisis menggunakan uji-t atau uji U. Hasil penelitian menunjukkan aktivitas belajar siswa mengalami peningkatan dengan rata-rata berkriteria baik 71,79. Hasil belajar siswa juga mengalami peningkatan, dengan rata-rata nilai N-gain 62,55. Dengan demikian, aplikasi LKS Berbasis Problem Based Learning dalam meningkatkan keterampilan berpikir kritis oleh siswa. Kata kunci : aktivitas belajar, ciri-ciri makhluk hidup, keterampilan berikir kritis, LKS berbasis problem based learning ]]>
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