The purpose of this study is to equip the necessary knowledge and skills in designing and organizing STEM educational activities in an approach related to the fields of science, technology, engineering and mathematics. The knowledge and skills are conducted according to the perspective of the 2018 general education program. Data were collected from 17 primary school teachers and 501 students studying at Tan Hung, Vinh Thanh, Vinh Loi Town Primary Schools of Long An Province, Phu Long Primary School of Dong Thap Province and Hieu Phung A Primary School of Vinh Long Province. Practical research methods such as observation and interviews were used to analyze data, evaluate the current status of designing and organizing appropriate STEM educational activities. From there, propose the design and organization of some STEM educational activities in teaching Mathematics 2..