Decimal to simplified fraction in SCSS

_fraction.scss

/* Decimal to simplified fraction (using the Euclidean algorithm)
---------------------------------------------------------------------------------- */

@function fraction($num) {
	$top: $num * 100;
	$bottom: 100;

	$return: '';

	$a: abs($top); $b: abs($bottom);

	@if($a < $b) {
		$old-b: $b;
		$b: $a;
		$a: $old-b;
	}
	@if($b == 0) {
		$return: $a;
	} @else {
		$r: $a % $b;
		@while($r > 0) {
			$a: $b;
			$b: $r;
			$r: $a % $b;
		}
		$return: $b;
	}
	
	@return ($top / $return) + '/' + ($bottom / $return);
}