The purpose of this study is to produce learning tools in integral subject matter with discovery learning models that meet valid, practical, and effective criteria. This research is categorized as a research development with the resulting product in the form of a Learning Implementation Plan (RPP), Student Worksheet (LKPD), and Evaluation of Learning Outcomes (EHB) of the Discovery Learning model on integral subject matter. The learning tool was developed using the Plomp model to the stage of assessment of the results of the field test, so that a final prototype is ready to be implemented and continued to be tested on a broader scope. The assessment of learning tools by the validator shows very valid criteria for the RPP, LKPD, and validation of the contents of the EHB. The practicality test of learning devices through the student response questionnaire and the teacher's questionnaire showed practical criteria. Evaluation of student learning outcomes shows mastery learning that can be categorized as effective.