Saengkaew, Puesapa, and Aweeporn Panthong. 2026. “THE EFFECTS OF LEARNING ACTIVITIES BASED ON THE CONCRETE – PICTORIAL - ABSTRACT APPROACH ON FRACTIONS FOR GRADE 6 STUDENTS”. NSRU Journal of Research and Innovation 1 (1):1-10. https://so14.tci-thaijo.org/index.php/PATRU/article/view/2800.