What do i wrong here
 

Excel is assuming that in the first case the textboxes are numbers sinc
you are subtracting them. In the second case, it assumes they are tex
(because the + sign can be used to concatenate text strings) so it i
concatenating.

Change the code to:

flydiff = (CDbl(TextBox7.Value) + CDbl(TextBox10.Value))

where CDbl converts to a double floating point variable type.



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