[1]
Yang, D.-C. , Chang, M.-C. and Sianturi, I.A. 2017. The Study of Addition and Subtraction for Two Digit Numbers in Grade One Between Singapore and Taiwan. American Journal of Education and Learning. 2, 1 (Apr. 2017), 75–82. DOI:https://doi.org/10.20448/804.2.1.75.82.