Brilliant catch!

You can also set the configuration setting in excel to "Precision As Displayed", as described in this KB article:

https://support.microsoft.com/en-us/kb/78113

This calls to mind the old days of writing programs in BASIC to do things like printing simple invoices on a dot matrix printer. Every once in a while you'd get an invoice with a total that looked something like 1E+7 instead of a useful price.