Kongsri, C. and Vallakitkasemsakul, S. 2024. 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. Journal of Graduate School, Pitchayatat, Ubon Ratchathani Rajabhat University. 19, 3 (Dec. 2024), 103–118.