Developing Learning Tools with Cooperative Learning Model of Numbered Head Together (NHT) Structural Approach on Sequence and Series Material

This research was underlined by the few availability of Mathematics learning tools as teacher’s guidance in implementing and low achievement students. aims to produce valid, practical, effective using cooperative models Numbered Head Together (NHT) structural approach on sequence series material. development conducted adapting a 4-D model Thiagarajan. The stages this consisted Define, Design, Development, Dissemination. validation results consisting syllabus, Lesson Plan, LKPD that are 92%, 92,07%, 94,33% with extremely valid criteria. practicality result small group trial is 93,99%, big 93,42% response 93,88% practical effectiveness shows students’ increases developed tools.