diff --git a/inc/functions.php b/inc/functions.php
index 1409c7b1..6ac50343 100644
--- a/inc/functions.php
+++ b/inc/functions.php
@@ -223,9 +223,33 @@
 		}
 	}
 	
+	// Highest common factor
+	function hcf($a, $b){
+		$gcd = 1;
+		if ($a>$b) {
+			$a = $a+$b;
+			$b = $a-$b;
+			$a = $a-$b;
+		}
+		if ($b==(round($b/$a))*$a) 
+			$gcd=$a;
+		else {
+			for($i=round($a/2);$i;$i--) {
+				if ($a == round($a/$i)*$i && $b == round($b/$i)*$i) {
+					$gcd = $i;
+					$i = false;
+				}
+			}
+		}
+		return $gcd;
+	}
+
 	function fraction($numerator, $denominator, $sep) {
-		$fraction = Array($numerator, $denominator);
-		return "{$fraction[0]}{$sep}{$fraction[1]}";
+		$gcf = hcf($numerator, $denominator);
+		$numerator = $numerator / $gcf;
+		$denominator = $denominator / $gcf;
+		
+		return "{$numerator}{$sep}{$denominator}";
 	}
 
 	/*********************************************/