HASRET KABARAN; NEŞE IŞIK TERTEMIZ. A Review of Primary School 2nd Grade Students’ Flexible Problem Solutions That Require Adding and Subtracting with Natural Numbers. Elementary Education Online, [S. l.], v. 18, n. 4, p. 1837–1857, 2023. Disponível em: https://ilkogretim-online.org/index.php/pub/article/view/1421. Acesso em: 22 dec. 2024.