All numbers which are not "zero" are classed as significant digits. Therefore in the number 129 there will be three digits which are classed as significant.
There are 2 significant digits: 5 and 4
There are 5 significant digits in number 14500. To count for a given number as to how many significant digits does it have, look for the first zero form left and decimal point. For ex sample 0045 has 2 significant digits 0.0045 has 2 significant digits 0.4500 has 4 significant digits.
Three: The first two zeros are not significant digits.
0.00909 has three significant digits.
Some persons consider as significant digits only 3 and 9; I think that is more correct to consider as significant digits 3,9,0,0,0. Other propose to add bars or points (as 39000.) for distinction but this system is not practically used.
There are four significant digits in the number 1.071.
Three significant digits.
This number has seven significant digits.
All four of the digits given are significant digits.
There are two significant digits in the number 83.
All numbers which are not "zero" are classed as significant digits. Therefore in the number 129 there will be three digits which are classed as significant.
Two. All nonzero digits are significant.
There are 2 significant digits: 5 and 4
All the digits are significant, so there are 5 significant digits.
There are four significant digits in the number 6.741.
The number 42.31 pounds has four significant digits.