Theppakan W, ๋Jetsadawiroj S. 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. jomld [internet]. 2023 May 30 [cited 2026 Aug. 28];8(5):81-9. available from: https://so06.tci-thaijo.org/index.php/jomld/article/view/260117