Mathematics is an indispensable part of our lives, and mathematical knowledge is also necessary in understanding the concepts of other fields such as social studies, music and art. The importance of cross-curricular connection, apart from the connection of mathematics with other teaching areas, is also evident in the way students receive and store information. By applying interdisciplinarity in teaching, the steps to achieving optimal learning are met and students are provided with a well rounded unit and understanding of the content on a deeper level. By reviewing the curriculum of teaching subjects for elementary schools and high schools adopted in 2019, incentives for correlation can be found in the elaboration of educational outcomes section. This paper aims to present some of the ways in which cross-curricular connections with Mathematics can be implemented in practice, and also discusses results of curriculum analysis, which showed, among other things, that Mathematics is little or not mentioned at all in the curricula of other subjects, while the Curriculum of the subject Mathematics for elementary schools and high schools lists the possibilities of correlation of mathematical contents with the contents of other subjects in almost half of the total number of educational outcomes included in early middle school teaching. The Croatian language and Nature and society are the subjects that, according to the curriculum, can be connected with the mathematical content to the greatest extent, and the contents of the domain D-Measurement are the most represented in this. Implementation of the new curriculum continues the much-needed transformation of traditional teaching into a present day one that meets the demands of modern society, of which mathematics is a vital part. However, teachers should not rely exclusively on guidelines from the curriculum in implementing an interdisciplinary approach in teaching. The possibility of cross-curricular connection is much greater than that directly stated in curriculum, and it is the duty of every teacher to autonomously inform and improve their teaching competencies with the aim of providing comprehensive and high-quality teaching.