Calculate a percent with SCSS/SASS

Question

I want to set a width in percentage in scss via calculation, but it gives me errors..

Invalid CSS after \"...-width: (4/12)%\": expected expression (e

Answer 1

Another way:

$my_width: 4/12*100%;

div{
width: $my_width; // 33.33333%
}

Sass will output the value in %.