VONGSIPASEUTH, B., PHOMMANITH, K., SENGALOUN , K. and SILIVANH , S. 2022. Mathematics Achievement on Probability using The Problem Solving Process of Polya for Students Grade 6: https://doi.org/10.69692/SUJMRD080255. Souphanouvong University Journal Multidisciplinary Research and Development . 8, 2 (Dec. 2022), 55–63.