The project consists of curricular activities, which aim at developing students' skills in the field of Mathematics (as priority), languages, Art, Geography, ... using flags. A project connects Maths and flags. We can see Maths on flags like geometric shapes, numbers, measurements etc. We can show them as mathematical tasks and solves. Students create assignments for the monthly topic themselves and provide solutions. Let us create our relationship with math. The project is intended, for 5th-8th grades (Croatian school), students (12-15 years old).