Let's say we have a result with the number 2624,499 and want to round it off to a certain number of significant figures. Some examples with different number of significant figures: a) 3 significant figures: 2420 or 2430? b) 4 significant figures: 2624 or 2625? c) 5 significant figures: 2624,4 or 2624,5? The question is about the fours, should one think that the 4 to the right is rounded off upwards to 5 because of the nines and then this 5 will round off the left 4 upwards to 5? Or should you simply "cut off" all significant figures after the ones you want to include?