KHEMPHAN , K. .; NUMNAPHOL, K. .; SARAKHUN, N. .; KALAM, S. .; WIRAT , U. .; SUMMART , P.; KOTA , S. . Developing of Learning Achievement in Mathematics subject group using Active Learning 6-steps Method of adding two numbers with a sum not exceeding 9 of Students Prathom Suksa 1 Ban Nong Chum School. Education journal Faculty of Education, Nakhon Sawan Rajabhat University , Nakhon Sawan,Thailand, v. 7, n. 2, p. 321–333, 2024. DOI: 10.2774.EDU2024.2.266708. Disponível em: https://so02.tci-thaijo.org/index.php/edunsrujo/article/view/266708. Acesso em: 17 apr. 2025.