Abstract :
This study aims to develop and produce valid mathematics learning tools. The learning tools developed were in the form of a Learning Implementation Plan (RPP) and Student Worksheets (LKPD) with a Mind Mapping-based Discovery learning model. The development of learning tools in this study uses ADDIE modification so that it becomes several stages, namely: 1) Analysis stage (Analyze); 2) the design stage (design); 3) the development stage (development). Researchers only did it to the development stage due to time constraints and Covid-19 which resulted in not being able to go to the field or school. The research instrument was the RPP validation sheet, the LKPD validation sheet. From the research results, the validity of the RPP was obtained with an average of 88.15%, with very valid validity criteria and the validity value of LKPD with an average of 86.05% with very valid validity criteria. Based on the results of the research, it can be concluded that this development research produces mathematics learning tools with the Discovery Learning model on the social arithmetic material of class VII MTs which has been tested for validity.