The Interactive Math (Matemáticas Interactivas) series appears to have come from the Estados Unidos, and based on its reversible Español manual (and dual language disc titles), possibly released South of the border.
I was able to snag tres (that's 'three') of the discs in the series, but the back of a couple of them indicate there is likely at least a fourth - "Fractions" - out there somewhere...
I've scanned (1, 2, 3 - reuse as you wish) and datted these with redump.org, so I'll call that preserved.
