Whit this iBook, 3D Geometry for Kids, your kids can manipulate with 3D objects. And that is not enough, they can print model of 3D object on paper and fold it in real. Perfect experience with math without math for your kids.
Only for $0.99 on iBooks Store: https://itunes.apple.com/us/book/3d-...74776116?mt=11
During the weekend of 9. - 11. november 2012 it is for free.