The correct answer is 2. The three zeros between the decimal point and the 1 are place holders but they are NOT significant digits.
See, for example, the Wikipedia link.
4 significant figures.
3 significant figures.
3 significant figures
4 significant figures.
7 significant figures.
2 of them.
How many significant figures are in 20.8
There are 3 significant figures in 94.2.
3 significant figures.
4 significant figures.
5 significant figures.
4 significant figures.
3 significant figures.
There are four significant figures in 0.1111.
4 significant figures.
How many significant figures are in 13001kg
4 significant figures.