There are 4 significant figures in this number.
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There are 2 significant figures in this measurement.
There are 3 significant figures
It has 2 significant figures. However, the fact that it is given as 2300 mm and not as 230 cm suggests that it is, in fact significant to 4 figures.
Two significant figures, 6 and 7.
3 0s to the left are insignificant and 0s that aren't right after the decimal or between other significant figures are insignificant