 <p>Try this:</p> <pre><code>padding: #{$padding / 10}rem; </code></pre> <p>Concatenating in SASS/SCSS uses ruby syntax, and you were mixing a mathematical equation followed by a concatenation, which is a variable type mix, so it's not suprising to me that it didn't work.</p> <p>Expressions and variables included within #{here} are assesed as if seperate to the rest of the line, and thus don't typecast the rest of the line. Also comes in handy if your output is getting quoted when you didn't expect (as does the unquote() function)</p>