1 of them.
There are three. The 4, the 5 and the zero in between. The two last zeros serve only to properly space the decimal point which, in this number, is implied.
The number 210 has two significant figures. In scientific notation, it would be written as 2.1 x 10^2 to explicitly show the two significant figures. Significant figures are the digits in a number that carry meaning contributing to its precision and accuracy. In this case, the digits 2 and 1 are considered significant in the number 210.
How many significant figures are in 20.8
There are 3 significant figures in 94.2.
4 significant figures.
There are four significant figures in 0.1111.
3 significant figures.
4487 has four significant figures.
There are four significant figures in 0.005120.
0.0375 has three significant figures.
101330 has 6 significant figures.