text: function add(a, b) {
      return a + b;
  }
  
  function subtract(a, b) {
      return a - b;
  }
  
  function multiply(a, b) {
      return a * b;
  }
  
  function divide(a, b) {
      return a / b;
  }
  
  exports.add = add;
  exports.subtract = subtract;
  exports.multiply = multiply;
  exports.divide = divide;
  
  
  