Please, teach with your iPad. Math applications can range from flash cards to graphing calculators. One day an iPad can be a textbook, next a calculator, then review sheets. Lately, there have been several reference apps that contain formulas and other reference material. Featured is a link to over 80+ iPad applications in math. With pictures from the applications and reviews on the positive side and how you can incorporate them into your classroom. If you have an iPad (or a classroom set) let your students learn in a fun and engaging way.
The link can be found here: http://teachwithyouripad.wikispaces.com/Math+Apps
Good luck and have fun teaching students with a great mobile device.