AbstrakKualitas shooting ditentukan oleh akurasi dalam menendang, yaitu ketepatan bola menuju gawang. Tujuan dari penelitian ini adalah mengukur kualitas shooting pada pemain sepakbola usia U-15. Pengambilan sampel dilakukan dengan menggunakan teknik acak sederhana, dengan jumlah sampel sebanyak 15 orang yang berasal dari Kabupaten dan Kota Jayapura, Provinsi Papua. Karakteristik sampel sebagai berikut: ber-usia 14,42 ± 0.76 tahun, dengan tinggi badan 160,23 ± 3,17 cm, dan berat badan 57,62 ± 4,85 kg. Target gawang sistem skor 0-10 serta bola dengan sensor dari smart ball Adidas miCoach digunakan sebagai instrumen dalam penelitian ini. Hasilnya diketahui bahwa perbandingan skor shooting antara kaki dominan dan kaki non dominan pada kondisi istirahat sebesar 2,11 : 1,98 dan pada kondisi lelah sebesar 1,53 : 1,93. Kualitas akurasi shooting masih lebih rendah dibandingkan kualitas shooting pemain profesional junior. Faktor utama penurunan kualitas shooting adalah pemain cenderung tidak stabil dalam menggunakan bagian punggung kakinya.Kata Kunci: sepakbola, akurasi , speed, spin, smart ball. AbstractShooting quality determined by the accuracy, means precision ball towards the goal. The purpose of this research was to measure the shooting quality of youth soccer player (U-15). Sampling was conducted using simple random technique, with a total sample of 15 respondents from Jayapura, Papua. Sample characteristic were age (years) 14.42 ± 0.76, height (cm) 160.23 ± 3.17 and body weight (kg) 57.62 ± 4.85. Shooting target with 0-10 scoring system and integrated sensor smart ball Adidas miCoach were used as research instruments. All data were calculated using descriptive statistics, followed by a two-tail test. The results shows that the difference of shooting accuracy between dominant and non-dominant leg within resting state and fatigue state were 2.11 : 1.98 and 1.53 : 1.93 respectively. The quality of shooting was still lower than standard for the junior professional playersThe main factor in low shooting quality is that players tend to be unstable in using the instep while shooting.

The aim of this service activity is to increase the understanding of Entrop Elementary School teachers about one of the basic concepts of mathematics, namely prime factorization, its application in solving mathematical problems, as well as creative aids that can be used in teaching the concept to students. The method used is the explanation of mathematical concepts about factors, prime factors, and prime factorization of a number with examples of its application in solving mathematical problems. After that, examples of teaching aids which can be used to explain prime factorization to students are given. The result of this activity is an increase in the understanding of Entrop Public Elementary School teachers about the mathematical concepts of prime factorization, this can be seen by comparing their pre-test and post-test scores. Of the 23 teachers who participated in the activity, 80% experienced an increase in the understanding of the concept.Keywords: entrop, factors, prime factors, prime factorization, mathematic

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