When they are between two non-zero digits or if there are after the decimal point.
For example,
the 0 is not significant in 1340 but it is significant in 1304 or 1340.0
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There is nothing that zeros are always considered. Zeros in some positions are significant, in other position are not. There is no always.
if between two other digits ex: 3009 or ending zeros when there is a decimal ex: 54.300
In the number 50.000, there are five significant digits. The zeros to the right of the decimal point are considered significant because they are trailing zeros following a decimal point. Trailing zeros in this context are significant as they indicate precision to the hundredths place.
Four - zeros between significant digits are significant.
In the number 30.1, there are three significant figures. The digits 3, 0, and 1 are all considered significant because they contribute to the precision of the measurement. Zeros that are placeholders or trailing zeros after a decimal point are also considered significant in this case.