Kongsri C, Vallakitkasemsakul S. The Action Research on Metacognitive Strategy Learning Activities Supplemented with Activity Packages Emphasizing on Mathematical Problem- Solving Processes on Linear Equation in One Variable Affecting Mathematical Problem-Solving Ability for the Seventh Grade Students. Pitchayatat [internet]. 2024 Dec. 25 [cited 2025 Apr. 3];19(3):103-18. available from: https://so02.tci-thaijo.org/index.php/Pitchayatat/article/view/269494