Title: Motion Math: Hungry Guppy
Summary: Kids have a splashing good time learning addition with this colorful guppy
Pros: They've done their research; the game is well-attuned to the learning and behavioral traits of its audience.
Cons: This app is a one-trick guppy -- all you do is feed it, which can get dull over time.
Bottom Line: Moves kids from concrete ideas to abstract concepts in a fun, appropriately paced manner.