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gustiany anisah. Learning activities and mathematical problem solving abilities using the connecting organizing reflecting extending (core) learning model For class VIII students of SMP Negeri 8 bukittinggi . THEOREMS [Internet]. 2024 Jul. 29 [cited 2025 Aug. 20];9(1):1-9. Available from: https://www.ejournal.unma.ac.id/index.php/th/article/view/7897