Integers ending in zero are always ambiguous. It is not possible to tell whether the given number is accurate to the nearest hundred (2 sig digs) or to the nearest unit (4 sig digs).
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All digits are significant except zeros closest to the decimal place. Thus, the 2300 at the end are all significant, giving four significant digits
Integers with trailing 0s are ambiguous. There are at least two significant digits but, if the number is known to be accurate to the nearest integer, there are 4
2300.m has four significant figures.
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.