Service clubs in the schoolyard math camp as a form of extra-curricular activities in mathematics in high school

Abstract. The article is devoted to the issues of class work in mathematics in high school. The issues associated with the various forms of organization of extra-curricular activities, such as schoolyards mathematical camps. As an effective form of interaction between students of different ages are considered special-interest clubs, is an example of the content material of one of them – the club "Cryptography".