Make It is an open source math game for android. It was created by Todd Pollak using java and XML in the eclipse ADT from Google.
Gameplay: To begin, choose Easy, Medium or Hard. Then, try to make the specified number using only the numbers and operators available. The fewer steps you take the reach the number the higher your score! The "C" button clears the input while the "Enter" computes a statement. Be careful! All input must be in the form (number - operand- number) or you will lose your progress. Numbers can be a maximum of two digits. There is no real way to win; numbers keep being generated. The whole point of the game is to better learn and understand the relationship between numbers. Your ten best scores will automatically be saved in High Scores.
Controls: To play the game, simply click on the desired numbers then either hit enter to see the result, or clear if you made a mistake. The back button takes to the menu where you can read over the instruction or check out your high scores.