3 significant figures.
There are four significant figures in the measurement 612.3 meters.
There are 2 significant figures in this measurement.
10800 meters has 3 significant figures.
There are 2 significant figures in this number.
3
If you mean "How many significant figures are there in 314.721 meters then the answer is 6.
4 significant figures
0.01223 contains 4 significant figures1.01 contains 3 significant figures
4.0600 contains 5 significant figures.
5 of them.
4
Four significant figures. Review you rules for significant figures. Some chemistry teachers, especially at the college level, are very concerned with significant figures.