Hasret Kabaran and Neşe Işık Tertemiz (2023) “A Review of Primary School 2nd Grade Students’ Flexible Problem Solutions That Require Adding and Subtracting with Natural Numbers”, Elementary Education Online, 18(4), pp. 1837–1857. Available at: https://ilkogretim-online.org./index.php/pub/article/view/1421 (Accessed: 29 December 2024).