Afwanil Huda Nasution^1,, Edy Surya¹, Mariani Mariani¹

The purpose of this research is to find a solution to the problems placed by SMA Negeri 1 Binjai in the form of; low mathematics learning outcomes, do not like mathematics, and 47% of students who exceeded graduation scores. Researchers try to provide a solution in the form of developing discovery learning tools. These learning tools include; RPP, student books (BS), teacher books (BG), and learning activities (LAS). The learning tools are structured based on the principles of the discovery learning model. The development model used in this study is Dick and Carrey, with the research subjects of SMA Negeri 1 Binjai students connecting 60 students, as well as on geometric transformation material. In the development process, two trials of learning devices were carried out with the aim of seeing the validity (expert validation), practicality (class validation and management) and effectiveness (classical completeness, achievement of learning objectives, learning time and student response) as a condition for quality development outcomes. Based on the results of the study, it was found that the diskpvery learning device met the criteria of validity, practicality and effectiveness.

learning tools, discovery learning, development research, mathematics learning outcomes