Sakuldee, P., Puttirungroj, C. and Areeraksakul Konglok, S. 2026. The Effects of Problem-Based Learning on Mathematical Problem-Solving Abilities and Mathematical Learning Achievement in Basic Mathematics for Careers among First-Year Vocational Certificate Students at Hat Yai Technical College, Songkhla Province. Interdisciplinary Academic and Research Journal . 6, 3 (May 2026), e293380. DOI:https://doi.org/10.60027/iarj.2026.e293380.