What do you mean by significant figures?

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Digits which are useful and make sense. For example a vehicle odometer can show 15.1km based on its meter. But writing 15.15km makes no sense to have the last digit. So only the 3 digits are significant
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Chemistry Teacher

No. Of certain digits plus one doubtful digit eg.. 0.0258 has only 3 significant figures bcs zeros on the left has no meaning
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