Pikunsri T, Chueasathuchon C, Chueasathuchon C. Variables Affecting Ability in Mathematical Reasoning of Matthayom Suksa 1 Students at Opportunity Expansion Schools under the Amnatcharoen Primary Educational Service Area Office. ubonreseva [internet]. 2021 Aug. 29 [cited 2026 Oct. 3];6(2):81-90. available from: https://so06.tci-thaijo.org/index.php/ubonreseva/article/view/251049