Drills and chants get a bad rap - but what better way is there to get your students into Spanish mode and get your cross-curricular skills in? I always start each class with a phonics drill and a math drill.
These slideshows guide the class or small groups in chorally reciting ADDITION equations using numbers up to 15. You could also use only slides with hidden answers to create flashcards for more independent work, although the flashcard-only version is also available at a lower price.
If you'd like a free sample, you can download just the X+1 slides here.
If you'd prefer a PDF instead of a PowerPoint, you can find that here, too.
For more Spanish math drills, check out these packages:
Addition Drills X+1 through X+14
Addition Flashcards X+1 through X+14
Four Basic Operations Drills
Four Basic Operations Flashcards