Countdown Manipulatives: Accelerating the Subtraction Proficiency of the Grade Two Pupils . Journal of Basic Education Research, [S. l.], v. 6, n. 2, p. 313–321, 2025. DOI: 10.37251/jber.v6i2.1787. Disponível em: https://cahaya-ic.com/index.php/JBER/article/view/1787. Acesso em: 20 may. 2026.