JavaScript Math.round has issues with floats. This gives correct result. Inspiration: http://stackoverflow.com/questions/20701029/rounding-issue-in-math-round-tofixed

angularjs.filter.coffee

angular.module('app').filter 'round', () ->
	(input, decimals) ->
		return Math.round(input * Math.pow(10, decimals)) / Math.pow(10, decimals)

javascript.js

function RoundNum(num, length) { 
    var number = Math.round(num * Math.pow(10, length)) / Math.pow(10, length);
    return nnumber;
}