Posted by lyne on Wednesday, January 7, 2009 at 9:03pm.
http://www.cartage.org.lb/en/themes/Sciences/Chemistry/Miscellenous/Helpfile/Units/AdditionSubtraction.htm
I think 1 and 3 are ok.
I would have added #2 to give
1.00276, then rounded that to 1.0028. See the site above.
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