Excel keeps track of 15 significant digits.
If you're using these as text (phone numbers/id numbers), then preformat those
cells as text or start your data entry with an apostrophe:
'12345678901234567890
Are you trying to do calculations against these values?
> I am doing large number data entry, and excel is automatically converting my
> numbers to zeros after the first 15 digits...
> 123456789123456789 comes out looking like 123456789123456000
> It also appears to be calculating against the incorrect values.
> Can anyone help???

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Dave Peterson