Pages v5.5.3 and Numbers v3.5 on Yosemite cannot open AppleWorks documents. They are also horribly limited applications in comparison to the previous Pages '09 and Numbers '09 applications.
There is a free version of LibreOffice now in the OS X App Store named LibreOffice Vanilla (v4.4.4.4) that requires Mountain Lion or later. I found its ability to double-click, or drag/drop an icon onto it — failed to open the document. It must be done via the Open File… menu item. Thefree LibreOffice, downloaded directly from the Document Foundation, does not have these limitations, and unlike LibreOffice Vanilla, will also allow PDF documents dropped on the application icon to be edited. Visit the Get Help menu on their website for current documentation.
It has the ability to open ClarisWorks/AppleWorks v5/6 documents from Mac and Windows, providing they are word processing, or spreadsheet. Some graphic content, and Database content will open. The latter will loose all cell attributes if it can be opened at all.