Diagnosis in addition and subtraction operations student with Down Syndrome in 3rd grade elementary school. Boletim do Museu Integrado de Roraima (Online), Brasil, v. 15, n. 2, p. 70–95, 2024. DOI: 10.24979/bolmirr.v.15.i2.1295. Disponível em: https://periodicos.uerr.edu.br/index.php/bolmirr/article/view/1295. Acesso em: 19 jul. 2025.