There is nothing that zeros are always considered. Zeros in some positions are significant, in other position are not. There is no always.
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if between two other digits ex: 3009 or ending zeros when there is a decimal ex: 54.300
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.
Three. All nonzero digits are significant and zeros in between significant digits are always significant.
That is correct.