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I have 2 questions about sig figs that have been bothering me.

I worked out this calculation: (3.652 x 108) (42.8 x 10-6)

My answer was 67524.0192. I figured that since there is a 6 in the second parenthesis my answer should be only 1 sig fig. So I expressed it as 7 x 10^4 Can you even write scientific notaion like that without any decimals? It seems odd.

Another problem I have concerns rounding off. If for instance I have my final answer as 3.5673 and I have to use only 3 sig figs do I round from the 6 and change my answer to 3.60 or do I round from the 7 and change my answer to 3.56?

Thank you.

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# Homework Help: Concerning Significant Figures.

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