Kanchanaporn Butsrimuang และ Nongluk Viriyapong; Monchaya Chiangpradit. (2023) Effect of Learning Activity Management Emphasized Heuristics Thinking Method with Open-Ended Questions on Mathematical Achievement and Reasoning Ability on Ratio and Percentage of Prathomsuksa 6 Students. <i>Journal of Science and Science Education</i>, <i>6</i>(1), 161-170.Kanchanaporn Butsrimuang และ Nongluk Viriyapong; Monchaya Chiangpradit. "Effect of Learning Activity Management Emphasized Heuristics Thinking Method with Open-Ended Questions on Mathematical Achievement and Reasoning Ability on Ratio and Percentage of Prathomsuksa 6 Students". Journal of Science and Science Education 6 (2023):161-170.Kanchanaporn Butsrimuang และ Nongluk Viriyapong; Monchaya Chiangpradit. Effect of Learning Activity Management Emphasized Heuristics Thinking Method with Open-Ended Questions on Mathematical Achievement and Reasoning Ability on Ratio and Percentage of Prathomsuksa 6 Students. Faculty of Science, Ubon Ratchathani University:ม.ป.ท. 2023.