A psicopedagógico look at teaching multiplication of operations and division of natural numbers proposed 1st to 3 year in textbooks of early years of basic education. Research, Society and Development, [S. l.], v. 8, n. 2, p. e982564, 2019. DOI: 10.33448/rsd-v8i2.564. Disponível em: https://ojs34.rsdjournal.org/index.php/rsd/article/view/564. Acesso em: 28 jun. 2025.