Math Shake for Schools
There are two versions of Math Shake available. Math Shake; a free download with in app purchases for the level, and Math Shake for Schools; specifically designed for educators with all difficulty levels and no in app purchases. If your school is part of Apple's VPP program you can get a 50% discount off the price of Math Shake for Schools.
A free multitouch book called Share Your Thinking is also available to help you use Math Shake at home or in the classroom.