Validitas Pengembangan LKPD Eksplorasi Geometri Melalui Pesawat Kertas Berbasis RME

Abstract

This research is motivated by the low understanding of geometry material by students due to conventional learning processes that tend to be theoretical and abstract. One alternative solution is to provide contextual learning tools that can facilitate independent physical exploration. This research aims to produce a Student Worksheet (LKPD) "Geometry Exploration Through Paper Airplanes" based on Realistic Mathematics Education (RME) that is valid and suitable for use in learning. The type of research applied is research and development (R&D) by adopting the Plomp development model which is limited to two main stages, namely the preliminary analysis stage (preliminary research) and the design and development stage of the prototype (design and develop prototype). Data collection instruments are in the form of a needs analysis interview sheet and a Likert-scale standard instrument assessment questionnaire for expert validity testing. Qualitative data are analyzed by summarizing suggestions for improvement, while quantitative data are analyzed using the validity percentage formula. The results of the formative evaluation through expert validity testing (expert review) show that the developed LKPD falls into the "Very Valid" category with an average overall validity percentage reaching 88.6%. Specifically, the validity level was obtained from the accumulated scores of 88% from the material expert (accurate concept and RME syntax), 92% from the media expert (highly intuitive visual design and layout), and 86% from the language expert (concise and communicative instructional sentences). Based on these results, this concrete activity-based worksheet, folding origami paper airplanes, was deemed highly suitable for further assessment through a field trial to directly measure its practicality and effectiveness in the classroom.