Penelitian ini dilakukan untuk mengembangkan E-Modul model Brain Based Learning (BBL) berbasis Kurikulum Gunung Ciremai dengan mengangkat unsur etnomatematika pada materi bangun datar segiempat dan segitiga guna meningkatkan kemampuan berpikir kreatif matematis siswa. Penelitian ini berfokus pada proses pengembangan E-Modul, tingkat kevalidan dan kepraktisan produk, serta dampaknya terhadap peningkatan kemampuan berpikir kreatif siswa. E-Modul ini dikembangkan berdasarkan sintaks pembelajaran BBL dan indikator berpikir kreatif yaitu fluency, flexibility,originality, dan elaboration. Metode penelitian yang digunakan adalah Research and Development (R&D) dengan model pengembangan ADDIE yang meliputi tahap Analyze, Design, Development, Implementation, dan Evaluation. Subjek penelitian yaitu 30 siswa kelas VII C di SMP Negeri 1 Kramatmulya. Data diperoleh dari hasil validasi ahli materi, ahli media, ahli budaya, respon guru, respon siswa, dan soal pre-test serta soal post-test. Teknik pengumpulan data dilakukan melalui angket, wawancara, observasi, dan tes yang sudah diuji validitas dan reliabilitasnya. Teknik analisis data yang digunakan meliputi uji kevalidan, uji kepraktisan, dan uji N-gain untuk analisis data. Kevalidan E-Modul diuji dengan angket yang diisi oleh dua validator ahli materi, dua validator ahli media dan satu validator ahli budaya. Hasil validasi menunjukkan E-Modul sangat valid dengan persentase 88,54% dari ahli materi, 81,94% dari ahli media, dan valid sebesar 72,5% dari ahli budaya. Kepraktisan E-Modul dinilai sangat praktis oleh guru (95,31%) dan siswa (84,93%). Teknik untuk menguji peningkatan kemampuan berpikir kreatif matematis yaitu dengan menggunakan uji N-Gain. Berdasarkan hasil analisis data untuk mencari N-Gain, E-Modul mampu meningkatkan kemampuan berpikir kreatif matematis siswa dengan rata-rata N-Gain sebesar 0,6 sehingga termasuk dalam kategori “sedang”. E-Modul model Brain Based Learning (BBL) berbasis Kurikulum Gunung Ciremai pada materi bangun datar segiempat dan segitiga dikatakan valid, praktis, dan dapat meningkatkan kemampuan berpikir kreatif siswa. Penelitian selanjutnya direkomendasikan untuk menyajikan motif batik Kuningan yang lebih autentik serta menambahkan fitur interaktif dan versi offline.
Kata Kunci: Bangun Datar Segiempat dan Segitiga, Brain Based Learning, E-Modul, Kemampuan Berpikir Kreatif, Kurikulum Gunung Ciremai

This study aims to develop an E-Module based on the Brain-Based Learning (BBL) model, integrated with the Gunung Ciremai Curriculum, by incorporating elements of ethnomathematics on the topic of flat shapes, specifically rectangles and triangles, to enhance students’ mathematical creative thinking skills. The research focuses on the development process of the E-Module, the validity and practicality of the product, as well as its impact on improving students’ creative thinking skills. The E-Module was developed based on the BBL learning syntax and the creative thinking indicators according to Torrance, namely fluency, flexibility, originality, and elaboration. The research method used is Research and Development (R&D) with the ADDIE development model, which includes the stages of Analyze, Design, Development, Implementation, and Evaluation. The subjects of the study were 30 students from class VII C at SMP Negeri 1 Kramatmulya. Data were collected through validation results from subject matter experts, media experts, cultural experts, teacher responses, student responses, and pre-test and post-test questions. Data collection techniques included questionnaires, interviews, observations, and tests that had been validated and verified for reliability. Data analysis techniques used included validity testing, practicality testing, and N-gain testing for data analysis. The validity of the E-Module was tested with questionnaires filled out by two subject matter experts, two media experts, and one cultural expert. The validation results showed that the E-Module was highly valid, with 88.54% from the subject matter experts, 81.94% from the media experts, and 72.5% from the cultural expert. The practicality of the E-Module was rated as highly practical by both the teacher (95.31%) and the students (84.93%). The technique used to test the improvement in students mathematical creative thinking skills was the N-Gain test. Based on the N-Gain data analysis, the E-Module was able to improve students' mathematical creative thinking skills with an average N-Gain of 0.6, indicating a "moderate" level of improvement. The Brain-Based Learning (BBL) E-Module based on the Gunung Ciremai Curriculum for flat shapes, specifically rectangles and triangles, was found to be valid, practical, and effective in improving students' creative thinking skills. It is suggested that future research display more authentic Kuningan batik patterns and add interactive features and an offline version to enhance student engagement and facilitate access to the materials.
Keywords:Brain-Based Learning, Creative Thinking Skills, E-Module, Gunung Ciremai Curriculum, Rectangular and Triangular Flat Shapes