It is difficult to say with integers ending in zero. The number could be acurate to the units' place or to the millionths' place (or anything in between). Therefore, there could be 1 to 7 sf.
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.
There are 4 significant digits in 5600.
There are three significant digits in 3.56.
Integers ending in 0 are always ambiguous. It is not possible to tell whether this number is accurate to the nearest million (1 significant figures) or to the nearest integer (7 significant figures).
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.