Yes, the iPad doesn’t do PowerPoint. It also doesn’t do Excel.
When I wrote these posts, Office Mobile for Office 365 hand’t been released.
It does do Numbers. There are lots of other spreadsheet apps for the iPad.
More interesting, however, is that it does Soulver. Soulver sits somewhere between a calculator and a spreadsheet. (It’s similar to a old Mac app I used to love called MathPad.) You may find that Soulver replaces any calculator app you might use. You may also find that it replaces many of the more straightforward uses of spreadsheets.
Also of possible interest here: Permanent. (I haven’t gotten to trying it out yet.)
Oh, and Numbers and Soulver both work on the iPhone and iPod touch as well as the iPad. (Although Soulver for iPhone is a separate app.)