Math Balls is a fun, addictive and very challenging educational game where you have to add numbers to clear the stage of bubbles. You can play this game online and for free at igre.games. Select the right numbers so that the sum of the selected numbers matches the number at the bottom of the screen. For example, if it says 17, you'll have to click on the five, four, six, and two to make them all pop up and continue playing. Good luck and have fun playing Math Balls!