gustiany, anisah 2024. 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 . Jurnal THEOREMS (The Original Research of Mathematics). 9, 1 (Jul. 2024), 1–9. DOI:https://doi.org/10.31949/th.v9i1.7897.