No: 0.0451 has exactly 3 significant figures.
72.5 has exactly 3 sig figs.
They can be 1230 or 0.0123
30.3 cm
30.5
101.01 has exactly five significant figures.
It has four significant figures.
3. But it is also not exactly wrong to say that there are 2 significant figures.
3 significant figures.
10.34
6040 has 3 significant figures.
3 significant figures.