<![CDATA[This research aimed to analyze student worksheet development based on Problem Based Learning model in topic of Probability for Senior High School students of grade X. The instruments which were used in this research were the validation sheet of student worksheet for math lecturer and teacher in order to fulfill the validity aspect, the student scoring sheet in order to fulfill the applicability aspect, and critical mathematic thinking ability test in order to fulfill the effectiveness aspect. The result of the research showed that the student worksheet which was based on Problem Based Learning model had fulfilled the requirements and appropriateness standard based on content, design, and language expert. The data analysis of t-test towards of critical thinking ability showed that the critical thinking ability of students with Problem Based Learning model worksheet was higher than the critical thinking ability of students without Problem Based Learning model worksheet.Penelitian ini bertujuan untuk menganalisis pengembangan model Problem Based Learning pada materi Peluang untuk SMA kelas X. Instrumen yang digunakan dalam penelitian ini adalah lembar validasi LKPD untuk ahli dan guru matematika untuk aspek kevalidan, lembar penilaian peserta didik untuk aspek keterbacaan, serta soal tes kemampuan berpikir kritis untuk aspek keefektivan. Hasil penelitian menunjukkan bahwa LKPD dengan model Problem Based Learning telah memenuhi syarat dan standar kelayakan berdasarkan penilaian ahli materi, desain, dan bahasa. Hasil analisis menggunakan uji t terhadap kemampuan berpikir kritis menunjukkan bahwa kemampuan berpikir kritis peserta didik yang menggunakan LKPD dengan model Problem Based Learning lebih tinggi daripada peserta didik yang tidak menggunakan LKPD dengan model Problem Based Learning.Kata kunci: berpikir kritis, peluang, problem based learning]]>
