Improving Students’ Learning Outcomes in Non-Numerical Pattern Recognition Through Problem-Based Learning Assisted by a Pictorial Pattern Board in Elementary School. KPD [Internet]. 31 Juli 2026 [dikutip 30 Oktober 2026];5(3):373-88. Tersedia pada: https://kpd.ejournal.unri.ac.id/index.php/kpd/article/view/619