Improving Student Activeness Using Problem Based Learning (PBL) Strategy in Science Subjects in Grade 3 at MI Muhammadiyah 01 Payaman. tematik [Internet]. 2026 May 31 [cited 2026 May 31];15(2):73-6. Available from: https://jurnal.unimed.ac.id/2012/index.php/tematik/article/view/68416