The Apple produced equivelents for those are Pages and Numbers (both available from the app store, $9.99 each in the US). Tehre are otehr apps that alow you to work with Excel and MS Word in the app store that you might want to check out.
If you are using Pages and Numbers, the easiest way to get them on the iPad is via iCloud: http://www.apple.com/icloud/setup/ios.html
You can also use itunes and move them over via the synch process; or use an alternate cloud service like DropBox (particularly if you choose to go with something other than Pages and Numbers). www.dropbox.com