Baby's first instance variables

My First Instance Variables

def Calculator

  def add(num1,num2)
    @num1= num1
    @num2 = num2
    output("sum", num1 + num2)
  end

  def subtract(num1,num2)
    @num1= num1
    @num2 = num2
    output("difference", num1 - num2)
  end

  def multiply(num1,num2)
    @num1= num1
    @num2 = num2
    output("product", num1 * num2)
  end

  def divide(num1,num2)
    @num1= num1
    @num2 = num2
    output("quotient", num1.to_f / num2)
  end

  def output(operator, result)
    "The #{operator} of #{@num1} and #{@num2} is #{result}."
  end

end