Chumpoojan S, Thongmoon M. The Development of Mathematical Problem-Solving Ability by using Deductive Learning with GeoGebra Program on Preliminary Data Analysis Topic for Matthayomsuksa 6 Students. J Roi Et [internet]. 2021 Dec. 22 [cited 2025 Mar. 13];15(3):125-33. available from: https://so03.tci-thaijo.org/index.php/reru/article/view/242683