diff --git a/lib/less/node/color.js b/lib/less/node/color.js
index ad18cba..42ee22c 100644
--- a/lib/less/node/color.js
+++ b/lib/less/node/color.js
@@ -21,31 +21,14 @@ node.Color.prototype = {
             return Math.round(i).toString(16);
         }).join('');
     },
-    '+': function (other) {
+    operate: function (op, other) {
         var result = [];
-        for (var c = 0; c < 3; c++) {
-            result[c] = this.value[c] + other.value[c];
-        }
-        return new(node.Color)(result);
-    },
-    '-': function (other) {
-        var result = [];
-        for (var c = 0; c < 3; c++) {
-            result[c] = this.value[c] - other.value[c];
+        if (! (other instanceof node.Color)) {
+            other = other.toColor();
         }
-        return new(node.Color)(result);
-    },
-    '*': function (other) {
-        var result = [];
-        for (var c = 0; c < 3; c++) {
-            result[c] = this.value[c] * other.value[c];
-        }
-        return new(node.Color)(result);
-    },
-    '/': function (other) {
-        var result = [];
+
         for (var c = 0; c < 3; c++) {
-            result[c] = this.value[c] / other.value[c];
+            result[c] = node.operate(op, this.value[c], other.value[c]);
         }
         return new(node.Color)(result);
     }
diff --git a/lib/less/node/dimension.js b/lib/less/node/dimension.js
index 501c18f..80049b3 100644
--- a/lib/less/node/dimension.js
+++ b/lib/less/node/dimension.js
@@ -6,25 +6,17 @@ node.Dimension = function Dimension(value, unit) {
 
 node.Dimension.prototype = {
     eval: function () { return this },
+    toColor: function () {
+        return new(node.Color)([this.value, this.value, this.value]);
+    },
     toCSS: function () {
         var css = this.value + this.unit;
         return css;
     },
-    '+': function (other) {
-        return new(node.Dimension)
-                  (this.value + other.value, this.unit);
-    },
-    '-': function (other) {
-        return new(node.Dimension)
-                  (this.value - other.value, this.unit);
-    },
-    '*': function (other) {
-        return new(node.Dimension)
-                  (this.value * other.value, this.unit);
-    },
-    '/': function (other) {
+    operate: function (op, other) {
         return new(node.Dimension)
-                  (this.value / other.value, this.unit);
+                  (node.operate(op, this.value, other.value),
+                  this.unit);
     }
 };