Bercasio, Pia Gail, Nestor Jr Lasala, and Ryan Dio. “Speed Meets Accuracy: Effectiveness of Left to Right Method on Mental Addition and Subtraction Skills of Elementary Students”. Journal of Basic Education Research 6, no. 2 (May 25, 2025): 189-201. Accessed June 1, 2025. https://cahaya-ic.com/index.php/JBER/article/view/1735.