The geography is aligning at the border of the natural and human sciences and due to the manifoldness of its contents has an extended relational network to other subjects. It is necessary to build on these tight relations in order to reach the aim that students would have a comprehensive, complex knowledge. The competence means such facility that spans several disciplines and consists of abilities, skills and attitudes which enable the exertion of the knowledge. According to the curriculum there are seven competencies, of which development is possible and required in case of any subjects. The present paper deals with the appearance of the mathematical competence at the geography lessons and with the review of the development customs and possibilities for the sake of creating conscious synthesis between different subjects.