You'll need to purchase an app from the android market such as DocsToGo or QuickOffice. They may have free trial versions so that you can test before you upgrade to the paid full versions.
Polaris Office are already installed in my Asus TF device, it works well. However, for some highly formatted docs/slides, I found some major error, especially for embedded picture.
Olive is free; however functional it is not. It freezes too often and when I played with it, it did not see the external card. Go with one of the major pray applications to reduce stress. I have used DEG for years on the Palm and Windows platform.