3.
In 30900 there are [at least] three significant figures.
30.900 has 5 significant figures.
3 in A+
4 significant digits.
3.
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
Five. All nonzero digits are significant and zeros in between significant digits are significant.
It has two significant digits.
3 significant digits.
It has 3 significant digits.
4 significant digits.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.