No, they are not.
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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.
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.
Five significant digits. Remember that all non-zero digits are significant, and all zeros in-between significant digits are significant.
Three. All nonzero digits are significant and zeros in between significant digits are always significant.