Simple Addition gone wrong

[Dimster]

Thanks for all this valuable information. I have tried all your suggestions except bplus string math (and I will be giving that a go as well) but it remains, the same short code I started this thread with will add the two values correctly, while none of the other suggestions have worked on the same math formula in my program. In meantime I'm going to remove a zero from MF value. In my program this does have the addition operational albeit  .0000009 higher than intended but de minimis .

I have to go back and rework your suggestions to be sure I am applying them correctly. Oh the joys of coding.

As always, thanks for the help.