Three. At first sight the answer might appear to be 2 but in that case the trailing should not be there. The fact that there is a trailing zero is an indication that the given number is accurate to 3 significant figures.
Three of them.
4
It has two significant digits.
It has 3 significant digits.
It has 6 significant digits.
How many significant digits does the following operation have(40,200.0 * 0.000240) - 2.778
Two. The zero is just a placeholder.
4
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 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.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
000203 has 3 significant digits.
Three significant digits.