text: var math = {
  
  	/**
  	 * 배열 크기
  	 */
  	arrayCnt : 10,
  
  	/**
  	 *
  	 * @returns {number}
  	 */
  	makeNumber: function ( digit ) {
  
  		var num = 1;
  		for( var i = 0; i < digit; i++ ) {
  			num = num * 10;
  		}
  
  		return Math.floor(Math.random() * num) + 1;
  	},
  
  	/**
  	 *
  	 * @returns {Array}
  	 */
  	makeNumberArray: function (operator, digit1, digit2) {
  		var tempArray = [];
  
  		for( var i = 0; i < math.arrayCnt; i++ ) {
  
  			var num1 = math.makeNumber(digit1);
  			var num2 = math.makeNumber(digit2);
  			if( operator === '÷' || operator === '-' ) {
  				while(true) {
  					if( num1 > num2 ) {
  						break;
  					} else {
  						num1 = math.makeNumber(digit1);
  						num2 = math.makeNumber(digit2);
  					}
  
  
  				}
  			}
  
  			tempArray.push({
  				num1        : num1,
  				num2        : num2,
  				answer      : null,
  				correct     : null,
  				remainder   : null,
  			});
  		}
  		return tempArray;
  	},
  
  	marking: function ( numArray, calcType ) {
  		var numArrayLength = numArray.length;
  		for( var i = 0; i < numArrayLength; i++ ) {
  
  			if( calcType == '+') {
  				numArray[i].correct = numArray[i].num1 + numArray[i].num2;
  			}
  			if( calcType == '-') {
  				numArray[i].correct = numArray[i].num1 - numArray[i].num2;
  			}
  			if( calcType == '×') {
  				numArray[i].correct = numArray[i].num1 * numArray[i].num2;
  			}
  			if( calcType == '÷') {
  				numArray[i].correct = parseInt(numArray[i].num1 / numArray[i].num2);
  				numArray[i].remainder = parseInt(numArray[i].num1 % numArray[i].num2);
  			}
  		}
  		return numArray;
  	}
  
  };