"Despite my ramblings and complaints about the $99 subscription needed to properly use Microsoft's office last week, I have come to enjoy using PowerPoint for iPad in the classroom. No, I have not paid the money to subscribe. In fact, I chose to actually delete Word and Excel as I don't see a need for them, and they were taking nearly 1GB of my iPad storage.
If you want to just use the free version of the three apps, you don't have the ability to edit nor create files. However, for PowerPoint, the “read-only” feature is actually very useful in my teaching. Since most people will have ready-made PowerPoints already created, they will be able to access and project them to their class using a projector."
Via John Evans