4, assuming the last zero is an indicator of precision.
4 of them.
0.3 has one significant figure.
Three.
2000 has one significant figure. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
1 significant figure.
2 of them.
It has 1 significant figure.
0.004 has 1 significant figure.
There are 1000 millimetres in one metre. Therefore, 2370 millimetres is equal to 2370/1000 = 2.37 metres.
1 significant figure. It can also be written as 4x10^6 (one sig fig)
Two significant figure
1 significant figure.
It has 1 significant figure.
3 significant figures.
3 significant figures.
One significant figure
1 significant figure.
10 significant figures.