Principal component in teaching mathematics for teacher is professional competence. It cover how the teacher understand the material of subject matter itself. Teaching Mathematics in Junior High School, teacher have to understand completely in Numbers, Algebra, Geometry and measurements, and also Statistics and probability. Based on the exam and discussion in workshop, known that math teacher in Pesisir Selatan having problems in teaching Geometry and measurement and also Statistics and probability. The problems are complexity of teaching materials, error in translating competence standard and basic competence into lesson plan, time management and student’s motivation in studying math. Solution that offered to the teacher are translating basic competence into learning process and trick how to teach Geometry and Statistics especially. Teaching geometry by explain all geometry object, i.e. plane and space simultaneously and compare each object directly. Teaching statistics and probability starting by counting process.

Kegiatan pembangunan hendaknya dilaksanakan dengan menggunakan perencanaan yang tepat. Perencanaan ini memerlukan informasi yang diperoleh dengan adanya data.  Nagari Tanjung Balik Kecamatan X Koto Singkarak merupakan salah satu nagari yang termasuk dalam Kecamatan X Koto Singakarak, Kabupaten Solok. Untuk perencanaan pembangunan, nagari ini memerlukan adanya informasi dan data. Namun, nagari ini tidak memiliki akses ke data sektoral yang terhimpun di BPS. Di sisi lain, nagari ini juga dihadapkan pada keterbatasan sumber daya yang memiliki pengetahuan tentang Statistika. Oleh karena itu, tim pengabdi melaksanakan Kegiatan Pengabdian kepada Masyarakat di Nagari Tanjung Balik untuk membantu mengatasi kedua masalah di atas.  Dari kegiatan pengabdian ini, pemerintah Nagari Tanjung Balik memiliki database yang terbaru, akurat, dan mudah diakses yang bisa digunakan untuk mengetahui informasi yang detail tentang masyarakat nagari ataupun untuk memetakan potensi dan masalah di nagari. Begitu pula, dari kegiatan ini,  pemerintah nagari telah memiliki kader yang bisa melakukan pengumpulan data di waktu yang akan datang dengan menggunakan aplikasi RSN dan mengelola database yang telah dibangun.

Sampah dapat diartikan sebagai bahan buangan dari hasil kegiatan manusia yang tidak lagi terpakai. Hingga saat ini, kuantitas sampah semakin meningkat dan bahkan melebihi jumlah penduduk. Pengalaman Belajar di Lapangan (PBL) II yang dilaksanakan kelompok 4 secara daring melalui WhatsApp Group dengan peserta sebanyak 14 orang dan dibantu oleh aparat desa. Hal ini bertujuan agar peserta yang masih kurang memahami materi dapat bertanya, sehingga penyuluh dapat membantu menggambarkan hal-hal yang masih belum dipahami. Hasil pre-test dan post-test, pengetahuan masyarakat mengalami peningkatan dari hasil rata-rata pre-test yaitu 59,82 meningkat menjadi rata-rata post-test 70,10 sedangkan sikap masyarakat mengalami penurunan dari hasil rata-rat  pre-test yaitu 60 menjadi rerata post-test 54,28. Hasil yang didapat melalui uji Wilcoxon pada pre test dan post test mengenai pengetahuan pengelolaan sampah yaitu p-value 0,008 artinya terdpat hubungan yang signifkan, dan untuk hasil sikap pengelolaam sampah yaitu 0,305 artinya tidak terdapat hubungan yang signifikan pada sikap dari hasil pre test dan post test setelah diberi materi.

The main idea of world maritime has been launched by the Indonesia’s Government through the development of inter-island connectivity, namely a logistics distribution line system using cargo ships with scheduled routes. However, in terms of inter-island sea transportation connectivity using sea transportation, the number of ships used for loading and unloading activities at Tanjung Priok in 2020 reached 11,876 units, which number decreased by 12.6% compared to the previous year, this figure was not sufficient for transportation of Indonesian loading and unloading goods (exports). This condition is important to note because the implementation of sea transportation, especially for sea toll transportation, if it cannot reach all regions, will cause freight transportation in some areas to be limited and regional economic growth cannot be distributed evenly. The purpose of this study is to predict the number of goods loaded (exported) at the Port of Tanjung Priok, by establishing an export forecasting model. Exogenous variable in the form of the Indonesian Wholesale Price Index. After analyzing the data, the order of the ARIMA model (5,1,1) was obtained as a parameter to estimate the ARIMAX model. From the ARIMAX model (5,1,1), the model's accuracy rate is 13.25% which is quite feasible to use to predict the total export cargo for the period January 2021-December 2021. Forecasting results show better fluctuations than in 2020.

Writing students worksheet is a routine task for each teacher. In this workshop, teachers design the worksheet using lesson study approach. Before design the learning material which is lesson plan and student’s worksheet, the teacher remind the basic concept of probability theory and its related topic. Related topics discuss are probability function, special distribution function, they are binomial and normal distribution. As assessment to the teacher, the devotee gave pretest in the first meeting and post test at the end of workshop. It item consist of lesson study concept, probability function, binomial and normal distribution. Depend on it, we see the increment of teacher’s competency.