Please find the fiddle http://jsfiddle.net/q2SgJ/5/
  
      WANTS:  {{val | number:2}} in \"input\"          
        
      
      
      
        
        
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You can write a directive to control this functionality.  It is not something that ships with angular, but directives can control how things look and work on the page.
I wrote a simple one: http://jsfiddle.net/q2SgJ/8/
This is the linking function that does the trick:
   link:function(scope,ele,attrs){
        ele.bind('keypress',function(e){
            var newVal=$(this).val()+(e.charCode!==0?String.fromCharCode(e.charCode):'');
            if($(this).val().search(/(.*)\.[0-9][0-9]/)===0 && newVal.length>$(this).val().length){
                e.preventDefault();
            }
        });
    }
This works at limiting the input to 2 decimal places, but doesn't format the input to two decimal places.  Anyways, it is a starting point.  I am sure you can look up other examples and write your own directive to handle this the way you want.  The thing about Angular is that it is not a framework with an answer to every question, but a framework that allows you to create additional functionality than what HTML5 provides alone and makes it very simple.