morning all.

Ok, I'm using sumproduct for a specific problem and I'm getting back a
miniscule value of 5.17E-13 as my difference.

The equation is:
=sumproduct((a1:a400<"")*(f1:f400))
I then do an IF equation, and it is:
=IF(a401=600,"ok",600-a401)
for my IF answer, I get back 5.17E-13.
I've checked all 800 cells in both columns A, and F. There are no equations
in any of them. If column A has cells that are blank, then the value in F
that's related to columns B or C will be ignored. I have corresponding
sumproduct equations for columns B and C as well, and both those do exactly
as needed.

All the other instances of these work fine on this workbook.

Is there a way that I can stop these miniscule value differences from
showing?
And yes, I had thought about using Round();I'd rather not.

Your helps are deeply appreciated.
Best.