Boonsuwan W. THE DEVELOPMENT OF MATHEMATICS ACTIVITY PACKAGES ON EQUATION AND EQUATION SOLVING, PRATHOMSUKSA 6 STUDENTS OF SCHOOLS IN EDUCATIONAL FUND PROJECT, LOPBURI PROVINCE. JEI [Internet]. 2020 Mar. 3 [cited 2024 Apr. 20];22(2):157-68. Available from: https://so06.tci-thaijo.org/index.php/edujournal_nu/article/view/240437