Since the pandemic appeared in our lives, teaching had to take another direction in which online teaching became more important and some of the students even began to demand frequent online classes. Online teaching has been implemented in a variety of studies and some master's degrees are beginning to be carried out entirely online, with the exception of exams or even up to these exams. In order to carry out this type of teaching and prevent them from losing track and interest in both the class in particular and the subject in general, many aspects need to be considered and dynamics that are attractive to them must be used. In this talk we will focus on mathematics, which is abstract and that many students recognize that they do not like or that it generates many problems for them. Therefore, this is another aspect that must be taken into account and given it the importance it deserves. To try to alleviate this type of extra difficulties, different activities have been developed and applied over the years and in this talk several of these activities used and that have gotten the student body involved are presented. These activities require careful planning and generally the use of different technologies that can help make working on mathematics more attractive to students. The activities presented include some that must be carried out synchronously, that is, during the class and at a previously set time. On the other hand, some activities will also be shown that have been carried out so that the students could work asynchronously, that is, without the need for the presence of the teaching staff. In addition, some of the answers given by the students to questions related to how attractive the activities or even the computer programs used to carry out or develop them are. Finally, some activities developed by the students to work on mathematics will also be presented and analyzed, since some aspects are presented that can help us develop new activities in the future. The methodology used in this research has been mixed, where different activities have been planned for the students on an online basis and they have been asked to evaluate said activity from a motivational point of view as well as from a personal contribution. From all the proposed activities, a selection has been made of those that have been well received by the students and that they consider to be useful for the classroom. Therefore, we present a selection of online activities to work mathematics that have given the best results, along with their characteristics and some adaptations to encourage group work.

Keywords: Mathematics, University, online, activities, technology.