No abstract

This study aims to develop a learning device using the Discovery Learning model with a scientific approach to sequence and series material and analyze its validity and efficiency. The model that will be implemented in the development of the learning device is a modification of the Thiagarajan model known as Four-D Models (4D Model) namely defining, designing, developing, and dissemination. However, the adopted model is the simplified model, limited to the development stage due to limited time and cost. It was found that the product developed was considered as valid, practical and effective. Learning devices has an average score of 3.56 having valid criteria. The results of practicality of learning devices obtained from the average results of the ability of teachers to manage learning, is 3.46 which is categorized as good. Additionally, the student response gathered by questionnaires shown up to 80% of positive responses by the students. The effectiveness of learning devices is obtained from the analysis of student activities that are categorized as good and from evaluating the student learning outcomes that show the value of concept mastery above 70.