Summart, P., & Viriyapong, N. (2021). Development of Mathematics Learning Activities Using KWDL Technique to Promote Mathematical Problem Solving Abilities and Learning Achievement on Percentage Problem Topic of Grade 6 Students. Journal of Roi Et Rajabhat University, 15(1), 75-86. Retrieved from https://so03.tci-thaijo.org/index.php/reru/article/view/240361