อุปทุม ว. The Comparison of Learning Achievement, Analytical Thinking and Attitudes toward Mathematics Entitled Ratio and Percentage of Matthayomsueksa 2 Students Between Using Constructivist Learning Activities and CIPPA Learning Activities. RMUTT J Hum Soc Sci [internet]. 2015 Dec. 31 [cited 2026 Sep. 4];2(2):24-36. available from: https://so05.tci-thaijo.org/index.php/RMUTI_SS/article/view/195434