This course examines integer numbers and their properties, principles of mathematical induction, divisibility and their properties, bases of numbers, prime numbers and their properties, greatest common factor (GCF) and its properties, Euclid‘s algorithm, least common multiple (LCM). ) and its properties, the relationship between FPB and KPK, congruence and its properties, linear congruence and its properties through active learning with a combination of lecture, discussion, question and answer methods and IT-assisted assignments. The assessment is determined with proportional weights and is carried out during the learning process with active interactive participation, assignments, mid-semester exams and final semester exams.