The answer sheet for my math book is full of errors and the book does not explain this concept at all. According to it :
(28,3 ± 0,05) x 4 = 113,2 ± 0,2
So one sig fig is added to the value and one is removed from the uncertainty.
(28,3 ± 0,05) ÷ 4 = 7,075 ± 0,0125 rounded to 7,08 ± 0,01
Here the number of sig figs for both the value and the uncertainty is maintained, but the value is rounded to one more decimal place.
I am confused as to what the rules are supposed to be here.
Thank you for your help.