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2021. THE EFFECT OF PROBLEM BASED LEARNING ON STUDENTS’ SCIENCE LEARNING ACHIEVEMENT AT GRADE IV ELEMENTARY SCHOOLS. Primary: Jurnal Pendidikan Guru Sekolah Dasar. 10, 1 (Feb. 2021), 1–7. DOI:https://doi.org/10.33578/10.33578/jpfkip.v10i1.8013.