When i sum the first numbers: I get 1.000000001

When I sum the Second numbers I Get = 100.01

But that's not the point.

And Easy way is to do is

=ROUND(D4*100,0) ==> this way all Digits are removed ==> 1.000000001

becomes 100

=ROUND(D4,0) ==> this way all Digits are removed ==> 100.01 becomes 100