The manual includes non-standard tasks that require the application of the knowledge gained in the lessons in the new conditions. Exercise opens wide opportunities for the development of children's observation, imagination, logical thinking. The manual is designed to help the teacher in organizing independent work of children in the classroom, can also be used during extracurricular hours at school and at home. The manual can be used in classes working on any mathematics textbooks for elementary school. The manual "For those who love mathematics" contains entertaining exercises of a developmental nature of various levels of complexity, which are designed for students of the 4th grade.