The present article is part of a study carried out with Secondary School students in Mathematics class. Our research interest lies in exploring the influence of using ICT (Information and Communication Technology) on students' attitudes and on how they learn mathematics, as observed when they are solving contextualized problems. This is a collaborative study between a Secondary School teacher and a University professor, following an action-research methodology. The triangulation of data collected through different instruments reveals that use of ICT in the classroom helped to improve attitudes and numerical learning in a large percentage of the students who participated in the experiment. (Contains 1 figure, 2 boxes, and 5 tables.)