<![CDATA[The aim of this research and development were to produce a worksheet based problem based learning model which suitable on tthematic learning for fifth class of elementary school, and to know the effectiveness of worksheet based on problem based learning model. The method of this research used research and development by Borg Gall. The population were students of fifth grade from 6 (six) schools with 166 students. The sample determined with purposive sample as many as 55 students from two class. The data were collected using questionnaire for feasibility of the worksheet and multiple choice and description for measuring effectivenes of the worksheet. The data were analyzed by using t-test formula. The research showed that worksheet based problem based learning model were suitable to be used and effective for enhancement learning outcome of student.Tujuan penelitian dan pengembangan ini adalah menghasilkan bahan ajar LKS berbasis model problem based learning yang layak pada pembelajaran tematik kelas V SD, dan mengetahui keefektivan LKS berbasis model problem based learning. Metode yang digunakan adalah penelitian dan pengembangan oleh Borg Gall. Populasi penelitian adalah siswa kelas V di 6 (enam) sekolah sebanyak 166 orang. Sampel penelitian ditentukan dengan purposive sampling sebanyak 55 orang di dua kelas. Alat pengumpul data menggunakan lembar angket untuk kelayakan, dan soal pilihan ganda dan uraian untuk mengukur efektivitas. Data dianalisis menggunakan rumus Uji-t. Hasil penelitian menunjukkan bahwa LKS berbasis model problem based learning layak digunakan, dan efektif meningkatkan hasil belajar siswa.Keywords: LKS, problem based learning, hasil belajar]]>
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