When dealing with the intermediate value of example: 570 +/- 100, how do you put this into it's final form? If I'm not mistaken, doesn't the uncertainty only contain 1 significant digit? Doesn't the uncertainty digit have to correspond to the final significant digit on the actual value as well? In that case, is the final answer 600 +/- 100 or is it appropriate to leave as 570 +/- 100 as the final answer?