Function Chaining & Classes

package {
    import flash.display.Sprite;
	public class Chaining extends Sprite{
		public function Chaining(){
			  print(n(100).divide(2).plus(2));
			  // outputs 52              
			  print(n(100).plus(n(10).multiply(2)));
			  // outputs 120
		}
	}
}

function print(n:Num):void{
   trace(n.getValue());
}
function n(n:Number):Num{
   return new Num(n);
}

class Num{
	private var value:Number;
	
	public function Num(n:Number):void{
       value = n;
	}
	private function convert(n:*):Number{
		if (n is Num) n = n.getValue();
		return n;
	}
	public function getValue():Number{
		return value;
	}
	public function plus(n:*):Num{
		n = convert(n);
		value += n;
		return this;
	}
	public function minus(n:*):Num{
		n = convert(n);
		value -= n;
		return this;
	}
	public function multiply(n:*):Num{
		n = convert(n);
		value *= n;
		return this;
	}
	public function divide(n:*):Num{
		n = convert(n);
		value /= n;
		return this;
	}
}

This snippet is meant to be run as a document class. It shows how one might go about designing a class to make extensive use of function chaining.