KALEKEEVA SARBINAZ TURKMENBAEVNA. Courses of mental arithmetics. Influence on child’s brain development. International Journal on Integrated Education, [S. l.], v. 3, n. 9, p. 254–256, 2020. DOI: 10.31149/ijie.v3i9.641. Disponível em: https://journals.researchparks.org/index.php/IJIE/article/view/641. Acesso em: 20 sep. 2026.