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Sari, Adhani Indah and Damri, Damri (2023) Improving the Ability of Subtraction Count Operations Using Abacus Media for Children with Mild Mental Disability: Single Subject Research in SLB Perwari Padang. Edumaspul: Junal Pendidikan, 7 (1). pp. 786-788. ISSN Print: 2548-8201 dan Online: 2580-0469