Spreadsheet calculations with Gnumeric

Gnumeric is the Gnome Project's Spreadsheet program, and it is the recommended application for working with spreadsheets on Xubuntu. It is - in its own words - "free, fast and accurate". Start it with Applications->Office->Gnumeric Spreadsheet.

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A Quick Guide and the full User Manual are available from the project's website.

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In case you need more features or better Microsoft Excel compatibility, you may want to install OpenOffice. It is readily available for installation from the Ubuntu software repositories (refer to the section called “Adding, Removing and Updating Applications”). Just be warned that it is a lot bigger and slower than Gnumeric!