Educational material aimed at children from 6 to 7 years of age to start and enjoy mathematics. "My Friend the Number" is a content of materials and various activities that aim to develop the mathematical thinking of our children. It comes with a tutorial DVD where you will find pedagogical guidelines. The whole book is worked with concrete materials and games because it is the natural way in which our children learn. The game is developed as a problem-solving approach to develop skills, reasoning, numerical calculation, as well as soft skills such as critical thinking, collaboration, creativity and autonomy that are needed in this information age.