Math Snacks is an excellent site for educational games, animations, and more, for Math grades 3rd-7th. This is a great learning tool to use w/ any Math curriculum and can help teachers differentiate instruction. Also, this is a nice way to introduce Game Based Learning into the classroom. Best of all are the abundance of teacher resources such as: lesson plans, teacher guides, etc etc, and all resources are aligned to Common Core Standards and available in Spanish.
Below is a brief demo...
I highly recommend checking out Math Snacks by clicking here!!!
For a more detailed review check out Graphite.