Simple chemistry question? The measurment rounded to three significant figures is

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sh.

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expressed as? The measurement 0.41006 gram, rounded to three significant figures, is expressed as?

0.41 g
0.410 g
0.4100 g
0.4101 g


i have no idea what the question is asking.
Which measurement has the greatest number of significant figures?

6.060 mg
60.6 mg
606 mg
60600 mg


i also dont get this :X please help!!!
 
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