Lakphet, K., Yamsang, W., & Yamsang, N. (2021). Diagnosis of Mathematical Deficiencies in Fractions of Prathom Sueksa Five Students at a School in Cluster 32, Prawet District Office, Bangkok Metropolis. Journal of the Association of Researchers, 26(1), 393–411. retrieved from https://so04.tci-thaijo.org/index.php/jar/article/view/250082