2 significant figures.
There are 2 significant figures in this measurement.
There are 3 significant figures in this measurement.
There are 3 significant figures in this measurement.
4
3 of them.
2
3
3 of them.
52.801
The four and the two fives.
Trailing zeros after a decimal point are not normally written. As trailing zero s have been written they must be significant; thus 0.050200 mg has 5 sig fig.
5 To the tenth of a milligram = 5.0000 g