I've done all the physics past papers, and the rule of how many significant figures an answer should be when multiplying or dividing is the lowest amount of significant figures you used. For example, 57.87 x 67.8 = 3920 (3SF).
In the papers, however, when ever they use 2 numbers with 3 significant figures, they ALWAYS answer in 2 significant figures. Is there a rule I am not aware of or what?
Any response, will be greatly appreciated.
Has yours come through yet?