Rahayu, T. et al. 2026. DEVELOPMENT OF PBL-BASED INTERACTIVE E-MODULES TO IMPROVE CRITICAL THINKING SKILLS OF GRADE 4 STUDENTS IN MATHEMATICS AT SDN 060866 MEDAN. Algebra : Jurnal Pendidikan, Sosial dan Sains. 6, 1 (Mar. 2026), 269–276. DOI:https://doi.org/10.58432/z9jz5248.