6
231.57 has five significant figures/numbers. All the numbers in 231.57 are significant.
3 significant figures.
2310 has 3 significant figures.
Five
Four - all nonzero numbers are significant.
460000
231.57 has five significant figures/numbers. All the numbers in 231.57 are significant.
The figure 18.03 has a total of four significant numbers
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).
$460000
There are 5 significant figures.
1 significant figure.
5 significant figures.
Three significant figures.
Four significant figures.
Four significant figures.