5 "G" class was an interesting lesson in mathematics. The theme of the lesson: "adding and subtracting common fractions". The key objective of lesson: to teach the same parts and components, reducing the variety of parts and add. The motto of the lesson: "a qualified will solve one problem, smart will solve a lot of tasks", so in the course of the lesson, pair work, individual work, test, "mathematical dominoes" game. On lesson, students with interest involved.