A mathematics trail (also maths trail or math trail) is a walk where you can discover and solve mathematical problems on real objects. Math Trails are a part of outdoor education. They can be used in school context to offer a reallife experience beside of textbooks. Nevertheless, a math trail requires good preparation and a solid postprocessing in the classroom.

Many examples for tasks coming from geometrical background. It is obvious to ask for the height of building or a statue, as well as asking for the volume of a pond. But there is more to discover, combinatorical problems can be solved, functions can be discovered or even statistics are possible.

Math Trails have been a thing since the 1980s. The project is about bringing this outdoor activity together with the possibility modern mobile devices are offering. A smartphone can display maps, photos of objects, it allows automatic feedback on solutions the users gives as input.