Fitriana, T. et al. 2026. Effect of Conceptual, Understanding, Procedural, and Problem-Based Learning Models Using a Contextual Approach on Students’ Conceptual Understanding Skills. Kognitif: Jurnal Riset HOTS Pendidikan Matematika. 6, 1 (Mar. 2026), 387–400. DOI:https://doi.org/10.51574/kognitif.v6i1.4433.