Ramadhan MH, Zulkardi Z, Putri RII. Designing Learning Trajectory for Teaching Fractions Using PMRI Approach with a Chessboard Context. supremum j of mathematics education [Internet]. 2022Jul.25 [cited 2024May7];6(2):162-70. Available from: https://journal.unsika.ac.id/index.php/supremum/article/view/5866