Abstrak
The aim of this study is development teacher books, student books, and LIT Valid, practice, and Efective . Methods This study use the development research of Plomp and Grameijer. This population is N = 249. Based on the analysis of data using ANOVA test α> Sig, then the mathematics problem solving ability of students to use teaching materials RME higher than conventional. As in this study resulted in three products namely student books, teacher books, and Local Instructional Theory (LIT).The result of research is made Book student, teacher books and LIT is Valid, Efective, and Practice. Problem solving mathematics is more important to impove To solve problem society 5.0.