diff --git a/tutorials/geometry/mathematical-operations/index.html b/tutorials/geometry/mathematical-operations/index.html
index c4338789..5923c864 100644
--- a/tutorials/geometry/mathematical-operations/index.html
+++ b/tutorials/geometry/mathematical-operations/index.html
@@ -74,24 +74,24 @@ <h1>Mathematical Operations</h1><p>
 // Create a second point that is 4 times the first one.
 // This is the same as creating a new point with x and y
 // of point1 multiplied by 4:
-var point2 = point1 * 4;
+var point2 = point1.multiply(4);
 console.log(point2); // { x: 40, y: 80 }
 
 // Now we calculate the difference between the two.
-var point3 = point2 - point1;
+var point3 = point2.subtract(point1);
 console.log(point3); // { x: 30, y: 60 }
 
 // Create yet another point, with a numeric value added to point3:
-var point4 = point3 + 30;
+var point4 = point3.add(30);
 console.log(point4); // { x: 60, y: 90 }
 
 // How about a third of that?
-var point5 = point4 / 3;
+var point5 = point4.divide(3);
 console.log(point5); // { x: 20, y: 30 }
 
 // Multiplying two points with each other multiplies each 
 // coordinate seperately
-var point6 = point5 * new Point(3, 2);
+var point6 = point5.multiply(new Point(3, 2));
 console.log(point6); // { x: 60, y: 60 }
 </pre>
 <p>
@@ -99,20 +99,20 @@ <h1>Mathematical Operations</h1><p>
 </p>
 <pre class="code">
 var point1 = new Point(10, 20);
-var point2 = point1 + { x: 100, y: 100 };
+var point2 = point1.add({ x: 100, y: 100 });
 console.log(point2); // { x: 110, y: 120 }
 
 // Adding size objects to points work too,
 // forcing them to be converted to a point first
-var point3 = point2 + new Size(50, 100);
+var point3 = point2.add(new Size(50, 100));
 console.log(point3); // { x: 160, y: 220 }
 
 // And using the object notation for size works just as well:
-var point4 = point3 + { width: 40, height: 80 };
+var point4 = point3.add({ width: 40, height: 80 });
 console.log(point4); // { x: 200, y: 300 }
 
 // How about adding a point in array notation instead?
-var point5 = point4 + [100, 0];
+var point5 = point4.add([100, 0]);
 console.log(point5); // { x: 300, y: 300 }
 </pre>
 <section id="math-functions"><a name="math-functions" title="Math Functions" class="anchor"><h2>Math Functions</h2></a></section>
@@ -141,11 +141,11 @@ <h1>Mathematical Operations</h1><p>
 <pre class="code">
 // Create a point whose x is between 0 and 50,
 // and y is between 0 and 100
-var point = new Point(50, 100) * Point.random();
+var point = new Point(50, 100).multiply(Point.random());
 
 // Create a size whose width is between 0 and 50,
 // and height is between 0 and 100
-var size = new Size(50, 100) * Size.random();
+var size = new Size(50, 100).multiply(Size.random());
 </pre>
 </article>
 <aside>