0.023 m has (a)   significant figures.

890 kg has (a)   significant figures.

91010 cm has (a)   significant figures.

910.0 m has (a)   significant figures.

1090.0010 mL has (a)   significant figures.

0.00120 L has (a)   significant figures.

3.4 x 10⁴ g has (a)   significant figures.

9.0 x 10^-3 m has (a)   significant figures.

9.010 x 10^-2 m has (a)   significant figures.

0.00030 g has (a)   significant figures.

1120010 kg has (a)   significant figures.

780.0 km has (a)   significant figures.

10200 mg has (a)   significant figures.

918.010 mm has (a)   significant figures.

0.0001 L has (a)   significant figures.

0.00390 L has (a)   significant figures.

8120 mm has (a)   significant figures.

7.991 x 10^-10 kg has (a)   significant figures.

720 m has (a)   significant figures.