Practice Math Worksheets on the iPad through Math Pentagon. Though the app is free, you do have to pay for the service. It definitely has a lot of potential.
In attempts to integrate mobile technology, educators are left to the mercy of app developers who or may or may not fully understand how imperative it is that our children become critical and creative thinkers.
I will highlight apps useful for developing higher order thinking skills
Apps that fit into the "remembering" stage improve the user's ability to define terms, identify facts, and recall and locate information.
Designed for 1st-2nd grade students, Murky Reef combines reading and math skills in the context of exploring a coral reef. This is the free version, though there is a more robust version available for $3.99. Students can review numbers, sight words, and vocabulary. There is some reporting built in.
This app supports math instruction by providing students with an opportunity to have virtual manipulatives similar to the blocks frequently used in classrooms.
"Mathtoons Media creates high level math learning tools that use wacky animation, humour and music. The Mathtoons Log App helps students learn how to change between exponential and logarithmic forms of an equation with the animated guidance of Captain Calculator and his assistant, Corporal MiniCalc."
This is the math app that has been featured in numerous iPad commercials. It is a great product for arithmetic drills and includes problems for addition, subtraction, and multiplication.