Theppakan, Wanwisa, and ๋Jetsadawiroj Siripat. “The compare students’ learning achievement on the Mathematics skill on percentage by using the learning on normal teaching of Matthayomsuksa 1 students at Navamindarajudis Khungthepmahanakhon school”. Journal of Modern Learning Development 8, no. 5 (May 30, 2023): 81–91. accessed April 12, 2025. https://so06.tci-thaijo.org/index.php/jomld/article/view/260117.