Suwanwong S, Yamsang W, Yamsang N. Diagnosis of Mathematical Defects in Addition, Subtraction, Multiplication, and Division of Prathom Sueksa Four Students at Schools in the Service Area of Chang Khwa Subdistrict Municipality, Kanchanadit District, Suratthani Province. jmhs1_s [Internet]. 2021 Sep. 30 [cited 2024 May 7];4(3):982-98. Available from: https://so04.tci-thaijo.org/index.php/jmhs1_s/article/view/250136