posttest taken classe tested moment used 409332016 ON every iii experiment model sample very instructional explore correlation thu OF CONTEXTUAL number dependent laguboti reg then population test item refused validator ACTIVITY direct purposive therefore increase selected ACHIEVEMENT formula taught received sampling statistical clas multimedia value especially while reliability choose INCREASE based 671 result text student school wa negeri analysi validated learning research purpose ability between than book HYDROCARBON time tcount TO data TEACHING LEARNING control showed product EFFECTIVENESS difference ttable instrument using grade chosen MULTIMEDIA allocation higher two valid achievement 714 ABSTRACT significant variable tambunan hydrocarbon SMA select mean chemistry CTL topic level STUDENTS amry before gain pretest instruction hypothesi