The book "Youngsters Solving Mathematical Problems with Technology" offers a comprehensive analysis of the mathematical problem-solving skills of young people and the role that digital technologies play in this process. It is based on the findings of the Problem@Web project, which examines how young people approach mathematical problems and communicate the results of their solutions. The focus is on the skills and strategies for mathematical problem-solving, as well as the perspectives of students and teachers regarding mathematics learning, particularly in the comparison between school and out-of-school contexts. By investigating the use of technologies, the book promotes a deeper understanding of the learning processes of young people in various environments. It is aimed at educators, researchers, and anyone interested in the intersection of mathematics and technology.