The purpose of our research is to study the possibilities of using outdoor teaching in mathematical education. We therefore want to investigate the current research literature and probe the views of a group of teachers to see how they conduct their outdoor mathematical teaching, with the aim of giving the pupils increased understanding of mathematics and to stimulate their desire to learn. The investigation consisted of four qualitative interviews of teachers in the first and fifth grades, three unstructured observations of first grade teaching and a literature review. The results show that outdoor teaching can be useful for mathematical education. When teaching is conducted outdoors it is easier to vary the lesson and easier to connect to the world around us and thus can communication benefit from it. Consequently we can conclude that teaching mathematics outdoors provides a good potential for a fun learning environment, but our data is not extensive enough to claim that the pupils' understanding increases from this.