Development of learning media based on to improve the mathematical problem solving abilities of grade 11 senior high school student

As it was found in many schools, the learning media have not helped educators in facilitating students in supporting an effective learning process. Learning tools which consist of a syllabus, lesson plans, teaching materials and learning outcomes tests that were used do not involve students actively. One effort that can be used is through discovery learning methods that are valid, practical and effective. Where this method was implemented by connecting the concept of learning with problems in everyday life and aimed to improve students' problem-solving abilities and teaching them how to solve problems until new knowledge was discovered by students. The aimed of this development was to produce a learning media based on discovery learning by using GeoGebra on valid and practical for second semester topic. This type of research was a development research using the Plomp development model which consists of three phases where the initial investigation, the development phase and the assessment phase. The research subjects were students of class grade 11 in Senior High School Number 2 Pulau Punjung. The results of the validity of the data analysis indicated the ddiscovery learning were in valid criteria in terms of content and validity of lesson plan with a percentage of 86.78% and the validity of worksheet was 82.24%. Practicality of learning media, attractiveness, comfort and time efficiency were 95% based on teacher questionnaire responses and 85.30% questionnaire responses for student learning media with discovery leaning method and the affectivity of discovery learning in term of completeness was 83. 87%.