There are three.
3.
30.900 has 5 significant figures.
3 in A+
In 30900 there are [at least] three significant figures.
There are three.
3.
30.900 has 5 significant figures.
3 in A+
In 30900 there are [at least] three significant figures.
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.