Math needs parenthesis?

[tmuka]

I'm giving the LESS version a try, and I suspect the margin and padding math needs to be wrapped in parenthesis

padding-left: @gutterWidth / 2;

should be
padding-left: (@gutterWidth / 2);

unless
padding-left: 10px / 2;

is some new syntax that i'm not familiar with and gives warnings in chrome dev-m.

Thanks for the cool grid!

[tmuka]

ah. it was because my Koala had "strict math" enabled. disabling that fixed the issue with math not being passed as strings