M Nur I, Diah Prawitha Sari, Saleh R. Student Proportional Reasoning on Missing Value Problems Based on Multiplicative Concepts. International j.of Elementary Education [Internet]. 28 Desember 2023 [dikutip 17 Juli 2024];7(4):749-58. Tersedia pada: https://ejournal.undiksha.ac.id/index.php/IJEE/article/view/57985