Technically it is 30.40 to 4 s.f. Note that you must explicitly specify the significance of any trailing zeroes to remove any ambiguity.
14.587020 has eight significant digits. If you were going to round it off to four, the answer would be 14.59
14.587020 rounded to four significant digits is 14.59
The 1st four digits are significant
Four - zeros between significant digits are significant.
111.009 rounded to four significant digits is 111.0
14.587020 has eight significant digits. If you were going to round it off to four, the answer would be 14.59
14.587020 rounded to four significant digits is 14.59
There are four significant figures in 1.004.
The 1st four digits are significant
Four - zeros between significant digits are significant.
All four of the digits given are significant digits.
1,071 has four significant digits.
Four - zeros between significant digits are significant.
111.009 rounded to four significant digits is 111.0
One - the four. None of the trailing 0s are significant digits.
Four of them.
Significant digits are digits that provide useful information, for instance 123 has 3 significant digits and 30010 has 4 significant digits. So basically zeros aren't significant unless they are between two other numbers. 0.1020 has only 4 significant digits. A+: 4