A geometry app with which the children interactively together can build different shapes.
My Geometric Universe is a great math app that allows children to learn about different shapes and tinker these together. The task is to choose a shape, cut them out and then put them together. The instructions are displayed, but not read, and mostly intuitive. Was the shape correctly assembled, it will open a mini clip that shows the shape in 3D. After each completed shape a new will be unlocked. Children are stimulated by the simple instructions and clips, so that they can tinker different shapes with paper independently. Unfortunately the app stucked while testing it.