Abstract:
This research aimed 1) to develop lesson plan on infinite sequences and series by using a flipped classroom via Google Classroom for the 12th grade students and 2) to study the effectiveness index of the learning management on infinite sequences and series by using a flipped classroom via Google Classroom for the 12th grade students. The design of this research was Quasi Experimental Research. The samples were 36 high school students in grade 12/3, which were obtained by cluster random sampling by drawing lots, in the academic year 2022 at Deebuk Phang Nga Witthayayon School, Phang Nga Province. There were 3 research instruments, including 12 lesson plans on infinite sequences and series by using a flipped classroom via Google Classroom for the 12th grade students, learning achievement tests, and the online lessons which were obtained from the online teaching project Project 14 of the Institute for the Promotion of Teaching Science and Technology. The data were analyzed by percentage and effectiveness index. The results showed that 1) the developed learning management had an efficiency of 72.94/76.25 and 2) after teaching with the lesson plan, grade 12 students had an effectiveness index of 0.69.