<!DOCTYPE html>
<html>
<head>
  <script data-require="angular.js@1.4.8" data-semver="1.4.8" src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.8/angular.min.js"></script>
</head>
<body ng-app>
    <div ng-init="variable = 5">
        This is my variable: {{variable}}<br/>
        And my variable * 3 is:<span ng-bind="variable*3"></span>
    </div>
</body>
</html>
http://blog.allii.ir/2016/01/angularjs-beginner-intermediate-course-basics/#directives