Suwanan Chiawdee และ Maliwan Phattarachaleekul; Nipaporn Chutiman. (2024) Development of Mathematics Learning Activities Based on Constructivist Theory Cooperated with Electronic Media to Promote Problem Solving Abilities on Triangle for Grade 6 Students. <i>Journal of Science and Science Education</i>, <i>7</i>(2), 446-455.Suwanan Chiawdee และ Maliwan Phattarachaleekul; Nipaporn Chutiman. "Development of Mathematics Learning Activities Based on Constructivist Theory Cooperated with Electronic Media to Promote Problem Solving Abilities on Triangle for Grade 6 Students". Journal of Science and Science Education 7 (2024):446-455.Suwanan Chiawdee และ Maliwan Phattarachaleekul; Nipaporn Chutiman. Development of Mathematics Learning Activities Based on Constructivist Theory Cooperated with Electronic Media to Promote Problem Solving Abilities on Triangle for Grade 6 Students. Faculty of Science, Ubon Ratchathani University:ม.ป.ท. 2024.