5 significant figures.
4 significant figures.
5 significant figures.
4 significant figures.
2 significant figures.
231.57 has five significant figures/numbers. All the numbers in 231.57 are significant.
Three. All nonzero numbers are significant, and any zeros in between significant numbers are significant.
Because 10.00400 is 10.004, this has five significant digits (numbers).
3 significant figures.
It has five significant figures.
7 significant figures.
3 significant figures.
There are 5 significant figures.
Two significant figures.
Four significant figures.
Four significant figures.
Three significant figures.