Within the framework of the subject decade of the Department of General Education Disciplines at the Talgar College of Agribusiness and Management on October 17, teacher Seisenkulova G. K. held an open lesson on the discipline "Mathematics" for 1st year students of the specialty "Accounting and audit" on the topic "Finding the roots of a polynomial with one variable by the method of factorization. Bezu's theorem". The teacher skillfully applied active teaching methods in the lesson. The performance of test tasks, the performance of tasks in notebooks and then the explanation of them at the blackboard by one of the students were surprisingly combined. Students learned to perform work according to the presented algorithm, to search for the necessary information to perform problem tasks using educational literature, to build arguments, to give examples. Seisekulova G. K. managed to involve even the weakest students in the discussion, using various ways of presenting complex material.