PELATIHAN BERHITUNG CEPAT DENGAN METODE JARIMATIKA DI MTSN 1 PROBOLINGGO. IEC-JEI [Internet]. 2025 Dec. 30 [cited 2026 Apr. 16];1(1):55-60. Available from: https://research.iecjournal.com/index.php/IEC-JEI/article/view/7