Follow up: In SharePoint 2003:
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Go to your list, and click Modify Columns and Settings.
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In the Columns section, edit the number column you wnat to format.
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In the Optional Settings For Column section, select a value other than "Automatic" from the Number Of Decimal Places drop-down list.
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Optionally, you can select the Show As Percentage check box.
I don't have the steps for SharePoint 2007, but I assume they are similar.
I hope this helps!