Sari, N. et al. 2026. Design Research to Learn Mathematics: A Study on The Effect of Problem-Solving Ability on The Creative Attitude of Junior High School Students. Mathline : Jurnal Matematika dan Pendidikan Matematika. 11, 1 (Feb. 2026), 143–156. DOI:https://doi.org/10.31943/mathline.v11i1.1101.