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Let's say that in a question you are given a value with 3 significant figures. Would you have to go to 3 significant figures after every calculation? Or would you round at the very end of all the calculations?
I think it would be safer to keep a lot of sig figs (more than 3 in your example) and then at the end, round it to 3 sig figs so that the calculations will be as accurate as possible. Sometimes it might not make a difference but it is more accurate.
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