What mistakes do elementary school students make when solving additive word problems?. Revista Torreón Universitario, [S. l.], v. 11, n. 30, p. 51–59, 2022. DOI: 10.5377/rtu.v11i30.13393. Disponível em: https://revistas.unan.edu.ni/index.php/Torreon/article/view/3048. Acesso em: 9 aug. 2025.