There is a great game called Alien Angles on mathplayground.com. This game is a fun game that helps you learn to estimate angles. To play this game on your computer visit mathplayground.com and then press the purple math games 1 button at the top of the page. You then need to scroll down to the bottom of the list and alien angles is on the left side. If you are playing on your iPad you have to use rover and then follow the same steps. Make sure you read the directions before you start. Good luck!