TRI WAHYUNI, E.; SUBIYANTORO, S.; SUPARTI. Improving The Ability to Perform Summary Calculation Operations Using Number Bag Media. Cognitive Development Journal, [S. l.], v. 1, n. 1, p. 17–27, 2023. DOI: 10.32585/cognitive.v1i1.1. Disponível em: http://ojs.edutechpublishing.com/index.php/cognitive/article/view/1. Acesso em: 14 jan. 2025.