KUSUMAWATI, A.; ISHARTIWI; HANDOYO, R. R. 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, [S. l.], v. 26, n. 4, p. 10.21070/ijins.v26i4.1730, 2025. DOI: 10.21070/ijins.v26i4.1730. Disponível em: https://ijins.umsida.ac.id/index.php/ijins/article/view/1730. Acesso em: 5 dec. 2025.