Strange sqrt behaviour

if i am using sqrt 2 off 100 (also quadratwurzel von hundert) the module outputs (output real) 10.0005!?? whats up has this something to do with the internal handling of valuses (as doubles) - even if i use frac befor i imput my values to sqrt i get the same.

ok sorry - i got it - i confused something a little. everyting works fine :)