"You can use the dimension box as a calculator by entering values and arithmetic symbols directly."

This is from the online help site: 2013 SOLIDWORKS Help - Modify Dimension

And I agree with it because I have used this feature for over 8 years. I thought it was a default.

At my new job, we use SolidWorks 2011, at this thing doesn’t work!!

Please help me get it fixed.

The numbers separated by arithmetic sign just doesn’t get read. And the modify box does not close (unless cancelled) if there are arithmetic signs in the box.