ABDUVALI’S, A. O. The Role of Mental Arifmetic in the Development of Child Mental Activity. European Multidisciplinary Journal of Modern Science, [S. l.], p. 26–28, 2022. Disponível em: https://emjms.academicjournal.io/index.php/emjms/article/view/696. Acesso em: 19 may. 2024.