Multi formulas scientific calculators are proving to be a boon for students for the advanced mathematics competition. This "Math Competition" was held in Thailand to solve the problem of advanced mathematics. In Southeast Asian countries, "STEM education (Science, Technology, Engineering and Mathematics)", which promotes education specialized in science, has been actively introduced. This "math competition" was held in cooperation between "OBEC (Office of the Basic Education Commission)" of the Ministry of Education of Thailand and Japan Company "Casio". In Thailand, students who are excellent in Mathematics challenge this exam. The calculator used in this competition is the scientific calculator produced by "CASIO". Students must use scientific calculators to solve the problem within an hour of time limit. The purpose is to use a scientific calculator to solve math problems and compete with each other to an increase in the interest of students in mathematics while having fun.