The fact that there is a trailing zero and the number is not given as 204.092 is indicative that the number is accurate to the nearest ten thousandths, not just the nearest thousandths. Therefore, it has seven significant figures.
Six, though it could be seven if it is known that the number is not 2040917, for example.
7 of them.
6, then ending 0 is not significant without a decimal
4
Five. All nonzero digits are significant and zeros in between significant digits are significant.
It has two significant digits.
3 significant digits.
It has 3 significant digits.
4 significant digits.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
000203 has 3 significant digits.
Three significant digits.