Phanha S, Jongkonklang S. A Study of Learning Achievement in Summation Subtraction Multiplication Dividing Fractions Unit and Group Work Behaviors of Grade Sixth Students by Cooperative Learning. Ratchaphruek [internet]. 2020 Mar. 27 [cited 2026 Sep. 12];18(1):110-8. available from: https://so05.tci-thaijo.org/index.php/Ratchaphruekjournal/article/view/212089