Ooops app for iPhone and iPad

Ooops presents a series of such problems that are solved by placing one or more sets of parentheses on the right side of the equation to make it equal to the number on the left. At any point the player can check their work by pressing the check button to see how their parentheses have changed the result. This will show them the steps of the problem as the operations are performed in order.

There is also a button to reveal how the computer solved the problem, although, that is not always the only solution.

The program allows children to sign in and to earn points towards stickers as they reach a certain total, up to 500. Problems are worth 1 to 5 points depending on the level selected. The level goes up to 5, but each level will also include problems from the lower levels.

The game is aimed at middle school and above, but younger children might be able to use it if they have been exposed to equations, or with adult support.