The organization of the education(teaching) by discipline leads(infers) at many pupil's a difficulty binding(connecting) the learnings(apprenticeships) realized in each of them. The education(teaching) of the mathematics remains even today that of an isolated, very sour(turned) discipline on herself(itself), little worried about interactions with the other domains. The transfer of the knowledge is not made. The work in interdisciplinarity should favor him(it). To give meaning to the taught mathematical concepts is an objective of the project, by showing their use in situations met by the pupils. During the learning(apprenticeship) of a mathematical notion, round trips between situations allowing to study the notion for herself(itself) and other situations putting the same notion in position of tool produce sense(direction) for the pupils and contribute to his(her,its) elaboration. An interdisciplinary approach seems interesting for all the pupils, for stronger reason for the underachieving students, as far as it gives meaning to the approached mathematical notions. The experience of the interdisciplinarity at the school brings capital gains to the pupils: - develop the cognitive equipment of the pupils: operate links, mobilize knowledge - Build and give meaning to the disciplines - conjugate the disciplines in the service of an objective of learning - build an object complexe:prendre consciousness of the complexity, learn to arrest an object give a complex - develop and exercise transverse skills: capacity to analyze, to interpret, to synthesize, to operate links When the results of the last investigation PISA reveal an increase of the disparities in numerous European countries between pupils in the mathematical domain, it seems to us essential to get down to this problem. And for it, it seems essential to cross our looks of teachers, to exchange on our professional practices in this domain and to imagine together new ways to be explored. Our approaches and our teaching methods in mathematics are intimately bound to the history and to the culture of our countries. It is up to us to analyze them to develop them mutually. We wish to favor collaborative activities between the various schools. Every partner will be invited to produce works in the various themes to share them and present them, but also propose very precise challenges to the other partners. We also envisage the possibility of developing works in several hands according to constraints defined to finalize a choreography with mathematical constraints where every partner will imagine a part. To optimize the crossing of the mathematics with the other disciplines, we shall work according to themes so defined: - mathematics and Arts (visual arts, music, dance, architecture) - mathematics and Sport (sports games(sets) to be imagined, measure of performances, realization of challenges coopétitifs with implementation of granted handicaps, orienteering race) - mathematics and study of the language(tongue) (creation of poetries, mathematical riddles, to learn to understand(include) a text math, elaboration of books(pounds) to be counted, of mathematical challenges for the partners) - mathematics and sciences in the nature (observation of mathematical phenomena in the nature, the analysis of data, organized by breedings, by plantations, initiation into the coding and into the IT programming with the creation of a video game) - mathematics and citizenship Mathematics and history(story) (study the various systems of numeration, the former(old) various measuring instruments, the conception(design) and the realization of traditional games(sets)) - mathematics and geography (organization and structuring of the space, the scales(ladders) of card(map), realization of polls(soundings) with management of data concerning the life of our schools, our countries, realization of route(course), education in the sustainable development by the participation in a challenge of schools in the positive energies) - mathematics to the everyday life(daily paper) The interest will be to concern a mathematical look our environment and to clear(release) of it of problems. And it is by this way(bias) that we shall make discover to the certain partners aspects of our cultures. The impacts waited on the pupils participating in the project are: - Develop the desire for the mathematics - Improve the skills in mathematics - Make them active in their learnings(apprenticeships) and help them to establish links between the various materials(subjects) (interdisciplinarity). - Bring them to become young adults, aware(conscious) of their membership in Europe, having developed attitudes constructive citizens who will allow them to become actors of their future. - bigger control(master's degree) of ICTS(INFORMATION AND COMMUNICATION TECHNOLOGIES) to the everyday life(daily paper) in the life of the classes for the search(research), the presentation(display) and the communication of the works.