On Tue, 1 Oct 2013 13:43:42 -0700 (PDT), wrote:

it now evaluates correctly. I see no obvious difference between the two workbooks. Why do I need to add "TEXT" to the formula in workbook "B" to get it to evaluate correctly?...TIA, Ron

In workbook B you have selected to enable the Lotus options. Where this is located depends on your version.

In Excel 2007+, they are under the Office Button / Excel Options / Advanced

In earlier versions, explore the Tools/Options drop down menu.