5 of them.
It has 1 significant figure.
0.004 has 1 significant figure.
3 significant figures.
1 significant figure.
One significant figure.
It has 1 significant figure.
0.004 has 1 significant figure.
0.3 has one significant figure.
The last four are significant.
1 significant figure. It can also be written as 4x10^6 (one sig fig)
1 significant figure.
1 significant figure.
1 significant figure.
1 significant figure.
1 significant figure.
1 significant figure.
3 significant figures.