DEVELOPMENT OF ONLINE LEARNING DEVICE WITH A CONTEXTUAL APPROACH TO IMPROVE STUDENTS' MATHEMATICS PROBLEM-SOLVING ABILITY

Learning device are an essential component in the implementation of learning. This study aims to produce online learning device characterized by a contextual approach as well as the characteristics of their implementation in improving mathematical problem-solving abilities, including lesson plans, student books, student worksheets, and math problemsolving tests on curved side space constructs. This research is design research using the Plomp research procedure, which consists of 3 phases: the Preliminary Research Phase, the Prototyping Phase, and the Assessment Phase. The subjects of this study were grade IX students at SMPN 1 Gianyar in the 2021/2022 academic year. The research results are in the form of online learning device with a contextual approach of valid, practical, and effective quality. The characteristics of the learning device in this study are (1) the lesson plans are easy to understand, (2) the student books and student worksheets (Math in Dimension Application) are exciting and easy to understand (3) Math in Dimension and problem-solving tests contain contextual problems, while the characteristics of the implementation of learning device are (1) Can be applied in online and offline learning modes, especially the Math in Dimension application can be used anytime and anywhere (2) Students can explore the material on the GeoGebra applet that is connected to the Math in Dimension application without the need to install the GeoGebra application (3) The application is easy to use and can increase students' learning motivation and mathematical problem-solving abilities.