[Tex/LaTex] Multiply the value by decimal number in latex


I used the following construct quite often:


But when I try to adjust the size a small bit, like this:


I get

! Package calc Error: `.' invalid at this point.

What am I doing wrong?

Best Answer

The calc package allows only division by integers or by reals which are announced as \real: so


will do, but


works as well, doesn't require calc and is faster.