Chitcharoen, D., Khunsanthia, M., Phuengsai, L. and Audphan, P. 2026. Effects of KWDL Instruction on Mathematical Problem-Solving Ability in the Pythagorean Theorem among Students in Mattayom Suksa 2. Education journal Faculty of Education, Nakhon Sawan Rajabhat University . 9, 2 (Jun. 2026), 190–201. DOI:https://doi.org/10.2774.EDU2026.2.283421.