990 has three significant figures.
Five. All nonzero digits are significant and zeros in between significant digits are significant.
This number has seven significant digits.
Three significant digits.
There are five significant digits.
All four of the digits given are significant digits.
2 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.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Three significant digits.
50.4 has 3 significant digits.
There are 3 significant digits in 20.0