Abstrak. Pembelajaran matematika di sekolah seringkali tidak kontekstual dan dikaitkan dengan budaya karena matematika dianggap tidak ada kaitannya dengan budaya yang ada. Sebagai kabupaten yang kaya akan budaya, pendidik di Kabupaten Banyumas dapat mengintegrasikan kekayaan budaya tersebut dalam pembelajaran matematika. Salah satu kekayaan budaya tersebut adalah berupa makanan khas yang terdapat di Kabupaten Banyumas. Tahu Kalisari merupakan produk tahu Kabupaten Banyumas yang memiliki cita rasa khas dan bentuk geometri yang beragam. Masyarakat Desa Kalisari yang mayoritas berprofesi sebagai pembuat tahu tanpa disadari telah menerapkan konsep-konsep matematika dalam proses pembuatan tahu khas Kalisari. Penelitian ini bertujuan untuk mengeksplorasi aktivitas yang melibatkan konsep-konsep matematika yang terdapat dalam proses pembuatan tahu khas Kalisari.Penelitian ini merupakan penelitian deskriptif kualitatif yang menggunakan pendekatan etnografi. Observasi, dokumentasi dan wawancara dengan pembuat tahu khas Kalisari digunakan sebagai teknik pengumpulan data. Penelitian ini menunjukkan bahwa pembuatan tahu khas kalisari melibatkan konsep-konsep matematika yaitu konsep geometri berupa bangun datar dua dimensi (persegi, persegi panjang) dan bangun ruang tiga dimensi (tabung tanpa tutup, setengah bola, balok, balok tanpa alas dan tutup, balok tanpa tutup, limas segiempat, dan bola), konsep pembagian, perbandingan senilai, dan kekongruenan yang dapat digunakan sebagai sumber pembelajaran matematika yang kontekstual.   Kata Kunci:   Etnomatematika, Tahu Khas Kalisari, Geometri, Pembagian, Perbandingan Senilai, Kekongruenan   Abstract. Mathematics learning at schools is often not contextual and culturally related because mathematics is considered to have nothing to do with the existing culture. As a district that is rich in culture, educators in Banyumas Regency can integrate the cultural wealth in learning mathematics. One of the cultural treasures is in the form of special foods found in Banyumas Regency. Kalisari tofu is a tofu product from Banyumas Regency which has a distinctive taste and various geometric shapes. Kalisari village community which majority of whom work as tofu makers, without realising actually applied mathematical concepts in the process of making special Kalisari tofu. This study aims to explore activities that involve mathematical concepts contained in the process of making special Kalisari tofu. This research is a qualitative descriptive study that uses an ethnographic approach. Observation, documentation and interview with Kalisari tofu makers are used as data collection techniques. This study shows that the production of special Kalisari tofu involves mathematical concepts, namely the concept of geometry in the form of two-dimensional flat shapes (square, rectangle) and a constructed three- dimensional shapes (tube without lid, hemispherical, block, block without base and lids, blocks without lids, rectangular pyramids, and spheres), concepts of division, direct proportion and congruence that can be used as a source of contextual mathematics learning.   Keywords:     Ethnomathematics, Special Kalisari Tofu, Geometry, Division, Direct Proportion, Congruence

Covid-19 kini tengah menjadi permasalahan nomer satu di segala penjuru dunia. Penyebaran yang begitu cepat serta belum di temukannya obat penangkal yang tepat membuat setiap orang takut terhadap paparan virusnya, terlebih ketika mengetahui bahwa sistem imunitas tubuh lah yang menjadi mangsanya. Upaya vaksinasi saja belum cukup untuk dijadikan jalan utama dalam penyelesaian masalah pengobatancovid-19. Salah satu cara yang efektif adalah dengan menengok kebelakang membuka tabir sejarah pengobatan tradisional berbahan tanaman herbal yang digunakan oleh nenek moyang, bisa menjadi opsi obat pencegah covid-19. Wilayah dengan tanah yang cukup subur dan di tumbuhi lumayan banyak tanaman herbal adalah Desa Cilongok. Namun pemanfaatan tanaman herbal di desa tersebut masih sangat minim. Dari permasalahan tersebut, maka penulis bermaksud mengadakan kegiatan pelatihan pembuatan obat herbal (jamu) pencegah gejala fisik covid-19 penambah imunitas tubuh sebagai upaya perlindungan diri terhadap bahaya covid-19. Serta edukasi mengenai materi seputar covid-19 untuk menumbuhkan sikap perhatian terhadap kesehatan diri disaat pandemi. Adapun hasil kegiatan yang dicapai pada kegiatan ini adalah meningkatnya kesadaran diri masyarakat Desa Cilongok tentang pentingnya tanaman obat herbal yang tumbuh di sekitar untuk dijadikan obat penambah imunitas tubuh serta betapa pentingnnya menjaga kesehatan di tengah pandemi dengan cara mematuhi protokol kesehatan.

The thing that underlies the implementation of this research is the low level of proficiency of class XI students at MAN Purbalingga in terms of solving mathematical problems. In this study, the researchers decided to apply appropriate learning strategies to foster skills in solving mathematical problems, namely by using the team teaching learning model with the mind mapping method. The purpose of the research conducted by researchers is to see whether there is a significant influence or not from the application of the learning model on students' skills in solving mathematical problems. This type of research is a Quasi-Experimental Design with a quantitative approach method. A total of 394 students from all students of class XI at MAN Purbalingga became the population in this study. Thirty-eight students from XI IPA 5 were assigned to be the experimental class, and 38 others from XI IPA 6 were the control class. The data collection carried out by researchers in this study was by applying an instrument in the form of a test, namely the pretest and posttest, to weigh the students' skills in solving mathematical problems. The results of the N-Gain Test conducted in the experimental class show that the average N-Gain value in that class is 0.58, which means that the class is in the medium category. Then in the control class, it is known that the average N-Gain value is 0.28, which means that the class is in a low category. From the acquisition of the average value, it is known that the experimental class shows results that are classified as superior when compared to the average value of the control class, so it can be concluded that there is an influence with the application of the team teaching learning model with the mind mapping method on the skills of students in solving mathematical problems in class XI MAN Purbalingga.

This research was motivated by the low ability of students' mathematical understanding of Higher Order Thinking Skill (HOTS) questions in class VIII SMP N 4 One Roof Kedungreja Cilacap. The researcher chose to apply the right learning strategy to learning to overcome the low ability to understand mathematics, namely the peer tutoring method. This study aimed to determine the effect of the peer tutoring method on students' mathematical understanding abilities on Higher Order Thinking Skill (HOTS) questions in class VIII SMP N 4 One Roof Kedungreja Cilacap. This research is quasi-experimental research using a quantitative approach. The population and sample of the study are all students of VIII SMP N 4 One Roof Kedungreja Cilacap, namely 27 students VIII A as the experimental class and 27 students VIII B as the control class. Data collection uses test instruments to measure students' mathematical understanding abilities. Taken from the results of the N-Gain test, an average of 0.5867 was obtained in the experimental class in the medium category. In comparison, the average in the control class is 0.2641 in the low sort. With the results of the average N-Gain score in the experimental class being superior to the control class, it can be concluded that the application of the peer tutoring method in learning affects students' mathematical understanding abilities on HOTS questions in class VIII SMP N 4 Satu Atap Kedungreja Cilacap. Keywords: Peer tutor method, Mathematical Comprehension, HOTS, Mathematics.

Kalisari Village, which is located in Banyumas Regency, is a well-known tofu industrial center area, and tofu has become the economic foundation of the Kalisari village community. The number of tofu producers also makes a lot of waste generated. With the PPKM in progress during this pandemic, tofu production and people's incomes have decreased. Therefore, the author organizes a service program in the form of hydroponic training as a solution to present new economic opportunities while reducing waste in Kalisari village. This training is expected to increase public interest in cultivating hydroponic plants. This training is expected to increase public interest in cultivating hydroponic plants. This training activity was carried out on Friday, August 13, 2021 at the hydroponic management @djiwatani. The methods used in this training are the wick system and the nutrient film technique system (NFT). The results of the training show that the people of Kalisari village are interested in cultivating hydroponic plants, besides that this hydroponic cultivation can later become a new source of income for the community and is proven to be environmentally friendly because it does not use pesticides and does not cause waste.Desa Kalisari yang terletak di Kabupaten Banyumas merupakan daerah sentra industri tahu yang sudah terkenal, dan tahu sudah menjadi tumpuan ekonomi masyarakat desa Kalisari. Banyaknya produsen tahu juga menjadikan banyak limbah yang di hasilkan. Dengan berlangsungnya PPKM dimasa pandemi ini menyebabkan produksi tahu dan pendapatan masyarakat menjadi menurun. Oleh sebab itu penulis menyelenggarakan program pengabdian berupa pelatihan hidroponik sebaga usaha pemberdayaan masyarakat serta solusi untuk menghadirkan peluang ekonomi baru sekaligus mengurangi limbah di desa Kalisari. Adanya pelatihan ini diharapkan dapat meningkatkan minat masyarakat untuk membudidayakan tanaman hidroponik. Kegiatan pelatihan ini dilaksanakan pada hari Jum’at tanggal 13 Agustus 2021 bertempat di pengelolaan hidroponik @djiwatani. Metode yang digunakan pada pelatihan ini adalah wick system dan nutrient film technique system (NFT). Hasil dari pelatihan menunjukan bahwa masyarakat desa Kalisari tertarik untuk membudidayakan tanaman hidroponik, selain itu pembudidayaan hidroponik ini nantinya dapat menjadi sumber pendapatan baru bagi masyarakat dan terbukti ramah lingkungan karena tidak menggunakan bahan pestisida serta tidak menimbulkan limbah.