Every number you see is a "significant digit" or "significant number". It means someone had an instrument sensitive enough to actually measure all of those and if there is any guessing on the real value, this guesswork would be AFTER the last 5.
50.775 is known to FIVE significant digits.
Three significant figures are in this number.
There are 4 significant figures in this number.
There are six significant figures in this number (i.e. all the figures here are significant).
Give the number of significant figures in this number:2.110
There are 4 significant figures in this number.
Three significant figures are in this number.
The number 805 has three significant figures.
There are 4 significant figures in this number.
There are 3 significant figures in this number.
There are 2 significant figures in this number.
There are 4 significant figures in this number.
There are 3 significant figures in this number.
There are six significant figures in this number (i.e. all the figures here are significant).
There are 3 significant figures in this number.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
There are 3 significant figures in this number.
Give the number of significant figures in this number:2.110