Kusumawati, A., Ishartiwi, & Handoyo, R. R. (2025). Contextual Concrete Media for Improving Subtraction Skills in Elementary Students: Media Konkret Kontekstual untuk Pemahaman Operasi Pengurangan Siswa Sekolah Dasar. Indonesian Journal of Innovation Studies, 26(4), 10.21070/ijins.v26i4.1730. https://doi.org/10.21070/ijins.v26i4.1730