Bubbling Math (http://bubblingmath.com/), a learning game for children in grades 1-4, is being offered for free until Friday, Jan. 20.

Here’s how the game is described: “Bubbling Math helps kids practice elementary math operations. It is a real game, complete with levels, music, sounds, and awards. It also contains a module that allows parents to choose which types of tasks they want their children to practice, and to review wrong answers afterward. iPad version is available as well. ”

As of Friday, the app will revert to its normal price of $3.99. Bubbling Math is also available for iPad on the Apple App Store for $1.99.