android apps for Maria

We are going to be spending a couple of weeks vacationing with Maria and her family. Maria will be entering fourth grade in the fall, but needs extra practice with reading over the summer. She has an android smartphone, so this is a perfect opportunity to have her test-drive lots of android apps.

We are looking for cool apps that will strengthen her word recognition, grammar basics, math facts, problem solving and memory. Oh, yes, and they should be free, not need wifi or internet access, and be fun.