Paper Title
A Production of Multimedia Lesson with Blended Learning in the Topic of Democratic for Grade 6 Students

Abstract
The purposes of this research were; 1) created the blended learning lesson plan for Grade 6 students, 2) finding out the efficiency of the multimedia lesson, 3) compare the pretest and posttest of learning achievement result with blended learning and 4) finding out the effective index of the student's learning. The samples did were 30 students in Innovation Demonstration School of Rajamangala University of Technology Thanyaburi (RMUTT), Pathum Thani, Thailand who studying in the subject of social study religion and culture in the second term of the 2018 academic year by using the simple random sampling with cast lots method. The instruments used in this research are the Blended learning lesson, learning outcome test. This research is the quasi-experiment research using the pretest-posttest one group design. The data analyses were E1/E2, mean, standard deviation and t-test dependent. The result of research showed that; 1) the efficiency of the multimedia lesson by the 80/80 standards had 83.95/85.57, 2) the learning achievement of students by using the blended learning lesson posttest higher than pretest had significantly 0.05 levels and 3) the effective index of this student's learning had 0.59 or 59 percent. Keywords - Blended Learning, Multimedia Lesson