MAHMOUD AHMED DARWISH. The study of numbers and basic operations, such as addition, subtraction, multiplication, and division. African Diaspora Journal of Mathematics ISSN: 1539-854X, Multidisciplinary UGC CARE GROUP I, [S. l.], v. 22, n. 2, p. 1–12, 2023. Disponível em: https://newjournalzone.in/index.php/ijmfsmr/article/view/45. Acesso em: 18 dec. 2024.