Posted by **Steven** on Friday, January 22, 2010 at 12:03am.

I'm really embarrassed to ask this! I knew how to do it before but I forgot after 2 years. I remember learning it for analytical chemistry :(

So a basic problem:

What is x= a+b+c?

given that:

a= 100.7 +/- 0.05

b= 0.61 +/- 0.005

c=226 +/- 0.5

OK. My question is the following:

I understand the answer is

x = 327.31 +/- 0.5025186564...

HOWEVER, I have no idea how the sig figs go.

Do I treat each part "separately?" And by part, I mean the thing before the +/- and the thing after. If I do that, then the part before is 327 and the thing after is 0.5..... is my answer than 327 +/- 0.5??? It looks incorrect :(

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