Penelitian ini dilakukan untuk mengetahui pengembangan dan kelayakan dari media pembelajaran website chatbot berbasis pemecahan masalah pada materi penyajian data untuk kelas IV sekolah dasar yang dilaksanakan di SDN Kapuk 05 Pagi. Metode penelitian yang digunakan dalam penelitian ini adalah  penelitian dan pengembangan (Research and Development) yang menggunakan empat tahapan dari model penelitian dan pengembangan 4-D Thiagarajan, yaitu: 1) define, 2) design ,3) develop, dan 4) disseminate. Adapun data yang diperoleh dalam penelitian ini diambil dari hasil observasi, wawancara, dan kuisoner. Data yang diperoleh selanjutnya dioleh menggunakan teknik analisis data statistik diskriptif. Adapun penilaian produk ini dari ahli materi sebesar 78%, ahli media pembelajaran sebesar 95,5 %, ahli bahasa sebesar 85 %, ahli desain instruksional sebesar  92%, hasil uji coba one to one evaluation sebesar 90,09 %, hasil uji coba small group evaluation sebesar 84%, hasil uji coba field test sebesar 82,1%, dan hasil penilaian responden guru kelas IV sebesar 93,3%. Berdasarkan hal tersebut, dapat disimpulkan bahwa media pembelajaran website chatbot berbasis pemecahan masalah memiliki kategori “sangat layak” serta “sangat baik” sebagai salah satu media pembelajaran matematika pada materi penyajian data.

This study aims to develop an interactive-based Student Worksheet (LKPD) using a live worksheet. Mathematics subject, volume material on cubes and blocks for fifth grade elementary school. The type of research used is research and development (Research and Development) or called R&D. The research model used is ADDIE (Analysis, Design, Development, Implementation, Evaluations), the research consists of 5 stages. The subjects in the study were 15 students in the VC class. The instruments used are expert validation assessment questionnaires (materials, media, language), preliminary interview study sheets for teachers and students as well as teacher and student response questionnaires. Data collection techniques used in the form of teacher interviews, observation of learning activities and questionnaires. The results of the validation of the assessment of the LKPD were 82.35% material experts, 93% media experts and 80% linguists. The accumulation of the three experts obtained a percentage of 85%, which can be categorized as "Very Eligible". The teacher's assessment got 90%. Then the assessment of the student response questionnaires at the trial stage obtained 90.7% and the assessment at the field test stage obtained as much as 90.9%, so it can be categorized as "Very Good". So that it can be seen the effectiveness of the LKPD from the acquisition of an average score of 90.7. The conclusion in this study, that interactive-based LKPD using live worksheets is very suitable for use in learning mathematics, and this interactive LPKD gets a positive response from teachers and students.

This study aims to develop Geometry Students Worksheet based on Realistic Mathematics for Learning in Elementary Schools. This study conducted for one year in elementary schools in DKI Jakarta. This study is a research and development (Research & Development/R & D) using mixed methods research with adapted from the models of Borg and Gall and models of Dick, Carey and Carey. Based on this model, there were four major stages, namely stages: (1) Research and information gathering that includes preliminary studies and needs analysis; (2) development of a draft that includes planning and developing the initial form of the product; (3) product testing and revision which includes expert testing/validation (expert judgment), one-on-one testing, small group evaluation, field testing, for each trial possible the revision of the product being developed; and (4) finalization and dissemination. The results showed that the use of Geometry Students Worksheet Based on Realistic Mathematics was able to improve the mastery of conceptual knowledge and procedural geometry of elementary school students. For that reason, Geometry Students Worksheet Based on Realistic Mathematics can be used as one of the Students Worksheet models used in mathematics learning in elementary schools. The results of this study recommend that Geometry Students Worksheet Based on problembased learning Geometry Students Worksheet Based on inquiry, Geometry Students Worksheet Based on scientific approaches, Geometry Students Worksheet Based on 4C skills (Critical Thinking, Creative, Collaborative, and Communication), and others.