If the measurement was of such precision that the zero to the right of the 3 could be measured with accuracy, then it has two significant digits {30}.
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Three significant figures are in this number.
There are six significant figures in this number (i.e. all the figures here are significant).
There are 4 significant figures in this number.
The number of significant figures should be equal to the significant figures in the least precise measurement.
4 significant figures.