Through Augmented Reality-based learning, this study aims to improve mathematical critical thinking skills. Learning with Augmented Reality-based media in Unity 3D can be used both online and offline. This research is quantitative (quasi-experimental), with 30 students from SMPN 34 Pekanbaru class VII participating in the academic year 2022/2023. The research was conducted on triangle and quadrilateral material. The following methods were used to collect data: (1) a mathematical critical thinking ability test; (2) interviews; and (3) documentation. The test result data was statistically processed, whereas the interview and documentation data were processed descriptively. The findings revealed that students who learned using Augmented Reality media with Unity 3D improved their mathematical critical thinking skills.

Latar belakang: Limbah minyak jelantah dapat terjadi dari aktivitas rumah tangga maupun industri. Minyak jelantah adalah minyak goreng yang digunakan secara berulang sehingga bilangan peroksdanya tinggi dan menimbulkan bau tengik. Limbah minyak jelantah ini biasanya dibuang sembarangan di lingkungan, sehingga menimbulkan pencemaran air maupun tanah. Tujuan: meningkatkan pengetahuan guru kimia dalam menyampaikan materi berbasis lingkungan seperti pelatihan ketrampilan pemanfaatan limbah minyak jelantah untuk diolah menjadi sabun, dan peningkatan pengetahuan tentang manfaat sabun untuk kesehatan (sebagai antibakteri dengan penambahan antioksidan kulit kayu secang atau serbuk daun jambu). Permasalahan yang dihadapi para mitra adalah kurangnya pengetahuan guru dalam mengajarkan praktikum yang berbasis lingkungan. Metode: Mitra program ini adalah para guru SMA bidang studi kimia di Jawa Tengah yang merupakan alumni D3 Pendidikan Kimia IKIP Semarang Angkatan Tahun 1983 yang sedang reuni berjumlah 11 orang, tempat kegiatan di Hotel Mahima Semarang. Metode yang digunakan adalah ceramah dan pelatihan pembuatan sabun dari minyak jelantah. Hasil: Nilai rerata pre-test tentang materi kimia 4,72 dan post-test 8,18; sedangkan tentang manfaat sabun bagi kesehatan pre-test 7,00 dan post-test 9,09 sehingga terjadi peningkatan pengetahuan tentang materi kimia 91,60% dan tentang kesehatan 29,85%. Kesimpulan: Pelatihan pembuatan sabun dari limbah minyak jelantah dapat meningkatkan kompetensi guru kimia dalam  mengajar materi yang berbasis lingkungan. Kegiatan ini disarankan untuk dilakukan secara berkelanjutan. Kata Kunci: minyak jelantah, peningkatan kompetensi, sabun, zat antibakteri __________________________________________________________________________________________ Background: Waste cooking oil can occur from household and industrial activities. Used cooking oil is cooking oil that is used repeatedly so that the peroxide value is high and causes a rancid odor. Waste cooking oil is usually disposed of carelessly in the environment, causing water and soil pollution. Objectives: to increase knowledge of chemistry teachers in delivering environmental-based materials such as skills training in the use of used cooking oil waste to be processed into soap, and increase knowledge about the benefits of soap for health as an antibacterial with the addition of antioxidants from secang bark or guava leaf powder. The problem faced by partners is the lack of knowledge of teachers in teaching environment-based practicum. Methods: Partners of the program are high school teachers in the field of chemistry in Central Java alumni of the D3 chemistry education IKIP Semarang Batch of 1983 who are having a reunion of 11 people, where the activity is at the Mahima Hotel Semarang. The method used lectures and training to make soap from used cooking oil. Results: The average value of the pre-test on chemistry is 4.72 and the post-test 8.18; while about the benefits of soap for health pre-test was 7.00 and post-test 9.09 so there is an increase in knowledge about chemistry material 91.60% and about health 29.85%. Conclusion: Training in making soap from used cooking oil waste from the environment can improve the competence of chemistry teachers in teaching environmentally-based materials. Keywords: waste cooking oil, competency improvement, soap, antibacterial agent

This research is motivated by the importance of mathematical critical thinking skills for students, as well as the rapid development of information technology in the digital era. This study specifically aims to improve students' mathematical critical thinking skills through the application of Augmented Reality (AR)-based learning media with 3D unity that can be used in online learning and offline learning based on Initial Mathematical Ability (IMA). Augmented Reality is a technology that combines three-dimensional virtual objects into a real environment and then projects these virtual objects in real-time. While the initial mathematical ability is one of the factors that influence the learning of mathematics, the higher the initial mathematical ability of a student, the better the level of the student's mathematical critical thinking ability. This research is quantitative research (quasi-experimental), while the research subjects are students at one of Pekanbaru's state junior high schools class VII for the academic year 2022/2023, as many as 30 students who are randomly selected by the class. This research was conducted on the material of flat shapes, especially triangles and quadrilaterals. The data collection method used was a mathematical critical thinking ability test. The test result data was processed by statistical tests, including a normality test, homogeneity test and two-way ANOVA test. The results showed that the improvement of mathematical critical thinking skills of students who received learning using augmented reality media with Unity 3D was better than the improvement of mathematical critical thinking skills of students who received conventional learning based on students' initial mathematical abilities.