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
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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
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.
There are 4 significant digits in 5600.