Abstract. This research aimed to produce a good quality learning aids using guided inquiry for comparison topics and describe the effectiveness of guided inquiry learning for comparison topics. This research was development research using 4-D model from Thiagarajan et al. The result of learning set consisted of lesson plan, student worksheet, and learning results test. The subjects of the study were class VII students that each of those has 46 students. Based on the result of the research in the experimental class, the learning aids using guided inquiry for comparison topics were good quality. The learning aids has met the valid, practical, and effective aspects. The result of the research in the implementation class showed that the learning with guided inquiry has fulfilled the effectiveness indicator. The ability of the teacher to manage the learning fulfilled the criteria of at least good, the student activity fulfilled the criteria of at least good, the student response to the learning aids and the learning activities were positive, and the students complete classical learning. Based on the result of this research, it was expected that the resulting learning aids can be used as an alternative learning aids for teachers in implementing mathematics learning for comparison topics.