DEVELOPMENT OF MATHEMATICS LEARNING DEVICE WITH GUIDED DISCOVERY MODELS ON CIRCLE MATERIAL

The research conducted is a development research that adapts to the model by Plomp development model(2010) which consists of3 phases, they are the preliminary research phase, the prototyping phase, and theassessment phase. The purpose of this study is to find out how the process of developing learning devicesand how the results of the development of mathematics learning tools in junior high school level that applyguided discovery models for circle that meets valid, practical, and effective criteria. In this study, researcheruses several instruments such us Learning Implementation Plans, Student Worksheets, and AssessmentSheets; observation instrument sheet of the implementation of learning; students’ questionnaire responseinstruments and the instrument of validation sheet. The results of this study is junior high schoolmathematics’s learning tools on the circle material using the guided discovery model. This learning toolhas been validated by experts and received positive responses from both teachers and students whenapplied in class. So, the mathematics learning device withguided discovery models on this circle materialhas fulfilled valid, practical, and effective criteria