Ningsih, D.K.L. et al. 2026. The Effect of Number Card Media on Mathematical Problem-Solving Skills Regarding Number Concepts Among Second-Grade Students at SDN 09 Tengah. Jurnal Inovasi Pendidikan MH Thamrin. 10, 1 (Jul. 2026), 271–277. DOI:https://doi.org/10.37012/jipmht.v10i1.3553.