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HTML 

              
                <div ng-app="app">
	<form ng-controller="GameCtrl" name="mathGameForm" class="game" ng-submit="checkAnswer()">
		<h1 class="text-center">Math Frenzy!</h1>
		<p ng-show="playingGame() || noGame()">See how many math problems you can answer correctly in one minute!</p>
		<p ng-class="{'alert-success': timer < 20, 'alert-warning': timer >= 20 && timer < 40, 'alert-danger': timer >= 40 && timer < 60 }" ng-show="playingGame()" class="alert h4 timer" role="alert">{{timer}}</p>	
		<p class="form-group" ng-class="{'has-error': isIncorrect(), 'has-success': isAnswer() }" ng-show="playingGame()">
			<label class="control-label center-block text-center h2">{{variables.x}} {{symbol}} {{variables.y}}</label>
			<input type="text" class="form-control" ng-model="answer" placeholder="Answer" />
		</p>
		<p class="h3" ng-show="endGame()">
			Time is up!</p>
		<p ng-show="endGame()">
			You answered {{correct}} out of {{correct+wrong}} correctly with an accuracy rating of {{accuracy() | number }}%
		</p>
		<div class="progress" ng-show="playingGame() || endGame()">
  		<div class="progress-bar" ng-class="{'progress-bar-success': accuracy() >= 75, 'progress-bar-warning': accuracy() >= 50 && accuracy() < 75, 'progress-bar-danger': accuracy() < 50}" role="progressbar" aria-valuenow="accuracy()" aria-valuemin="0" aria-valuemax="100" style="width: {{accuracy()}}%">
    <span>{{correct}} / {{wrong+correct}}</span>
  </div>
</div>
			<p class="text-center" ng-show="noGame() || endGame()">
			 <button type="button" ng-click="startGame()" class="btn btn-primary btn-lg"><span ng-show="noGame()">Start</span><span ng-show="endGame()">New</span> Game</button>
		</p>
	</form>
</div>
!

CSS 

              
                @import "compass/css3";


.game {
	margin: 3em auto;
	padding: 0 10px;
	max-width: 400px;
}

.timer {
	width: 100px;
	text-align: center;
	margin: 0 auto;
}
!

JS 

              
                angular.module('app', []).controller('GameCtrl', ['$scope', '$timeout', function($scope, $timeout){
	$scope.variables = {};
	$scope.correct = 0;
	$scope.wrong = 0;
	$scope.timer = 0;
	_start = false;
	_end = false;
	var _answer = null;
	var _answerCorrect = null;
	var _sym = ['-','+','÷','x'];
	
	function _initialize() {
		$scope.variables = {
			'x': Math.floor(Math.random() * (10)) + 1,	
			'y': Math.floor(Math.random() * (10)) + 1,
		};	
		$scope.symbol = _sym[Math.round(Math.random()*3)];
		switch ($scope.symbol) {
			case '-':
				_answer = $scope.variables.x - $scope.variables.y;
				break;
			case '+':
				_answer = $scope.variables.x + $scope.variables.y;
				break;
			case 'x':
				_answer = $scope.variables.x * $scope.variables.y;
				break;
			default:
				var x = $scope.variables.x;
				$scope.variables.x = x * $scope.variables.y;
				_answer = x;
				break
		}
		_answerCorrect = null;
		$scope.answer = null;
	}
	

	angular.extend($scope, {
		isAnswer: function (){
			return _answerCorrect === true;
		},
		isIncorrect: function (){
			return _answerCorrect === false;
		},
		accuracy: function(){
			return $scope.correct / ($scope.correct + $scope.wrong) * 100;
		},
		noGame: function(){
			return !_start && !_end;
		},
		startGame: function(){
			_start = true;
			_end = false;
			$scope.correct = 0;
			$scope.wrong = 0;
			$scope.timer = 0;
			$timeout($scope.increaseTimer, 1000);
		},
		playingGame: function(){
			return _start && !_end;
		},
		endGame: function() {
			return _start && _end;
		},
		increaseTimer: function(){
			$scope.timer++;
			if($scope.timer == 60){
				_end = true;
			} else {
				$timeout($scope.increaseTimer, 1000);
			}
		},
		checkAnswer: function(){
			_answerCorrect = parseInt($scope.answer) == _answer;
			if(_answerCorrect) {
				$scope.correct++;
				_initialize()
			}else{
				$scope.wrong++;
				$scope.answer = null;
			}
		}
	});
	
	_initialize();
}
																				]);
!
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