Figueiredo, MauroBidarra, JoséBostad, Rune2017-04-072017-04-072016978-3-319-40238-3; 978-3-319-40237-60302-9743AUT: MFI01071;http://hdl.handle.net/10400.1/9698Mobile devices, smartphones, phablets and tablets, are widely available. This is a generation of digital natives. We cannot ignore that they are no longer the same students for which the education system was designed traditionally. Studying math is many times a cumbersome task. But this can be changed if the teacher takes advantage of the technology that is currently available. We are working in the use of different tools to extend the classroom in a blended learning model. In this paper, it is presented the development of an eBook for teaching mathematics to secondary students. It is developed with the free and open standard EPUB 3 that is available for Android and iOS platforms. This specification supports video embedded in the eBook. In this paper it is shown how to take advantage of this feature, making videos available about lectures and problems resolutions, which is especially interesting for learning mathematics.engjournal article10.1007/978-3-319-40238-3_5