When you say you loaded them to iWork, do you mean to icloud.com, the Works app? That is where they need to be to sync to the iPad.
On the iPad, have you gone to Settings > iCloud and turned on Documents & Data?
Have you gone to Settings > Keynote and turned on Use iCloud?
The first sync can take quite a while, especially with Keynote presentations.
After they show up you will have to open them on the iPad at least once, to convert them to iOS versions. Again, this might take a little while. If any features were dropped in the conversion you should get a summary of what could not be supported.