Abstract :
This research aims to devolop mathematics learning device based on Realistic Mathematics Educatiton (RME). The learning device developed are in the form of a Learning Implementaion System (RPP) and Student Worksheets (LKPD) on the material on Subjects Systems of Linear Equation: Two Variable (SPLDV). Development research uses the ADDIE model with steps 1) Analysis, 2) Design, 3) Development, 4) Implementaion, and 5) Evalution. In this research, researcher modified it by eliminating the Implementaion step due to the Covid-19 pademic. The data collection technique was obtained from the validation data of two Mathematics Education lecturers FKIP UIR and one Mathematics Teacher of SMPN 2 Pekanabru. The data collection instrument uses a Validation Sheet. The data analysis technique is the analysis od the validation sheet results. The results of the research were obtained in the form learning implementation System (RPP) of 80,45% with very valid criteria and 83,75% of Student Worksheet (LKPD) with very valid criteria. Thus, it can be cocluded the development reasearch produces mathematics learning device (RPP and LKPD) that have proven their validity.