3.
There are three.
The number 30900 has three significant digits: 3, 0, and 9. The trailing zeros are not considered significant unless indicated by a decimal point (e.g., 30900. has five significant digits). Therefore, without a decimal point, the significant digits are limited to the non-zero digits and the leading zero.
In 30900 there are [at least] three significant figures.
30.900 has 5 significant figures.
3 in A+
There are three.
The number 30900 has three significant digits: 3, 0, and 9. The trailing zeros are not considered significant unless indicated by a decimal point (e.g., 30900. has five significant digits). Therefore, without a decimal point, the significant digits are limited to the non-zero digits and the leading zero.
In 30900 there are [at least] three significant figures.
30.900 has 5 significant figures.
3 in A+
Three. The two zeros on the end are just placeholders. 30900 has 3 significant figures.
4
It has 3 significant digits.
3 significant digits.
It has two significant digits.
Five. All nonzero digits are significant and zeros in between significant digits are significant.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.