Change the following measurements into scientific notation. Make sure to use correct significant figures.

1) 3,011.0 g ___3.0110 x 10³ g __

2) 0.021 mL ___2.1 x 10^-2 mL___

3) 128 mg ___1.28 x 10² mg___

4) 0.0010 km ___1.0 x 10^-3 km___

5) 840.0 m ___8.400 x 10² m___

6) 130,001.0 m __1.300010 x 10⁵ m

7) 0.0101 mm __1.01 x 10^-2 mm___

8) 0.900 mg __9.00 x 10^-1 mg___

9) 121.01 mL __1.2101 x 10² mL_

10) 100,000 m __1 x 10⁵ m_______

11) 30 oz __3 x 10¹ oz_______

12) 0.00950 miles __9.50 x 10^-3 miles_

How many significant figures are in each of the following measurements?

13) 7030 g __3__

14) 4.0 kg __2__

15) 0.060 hr __2__

16) 4002 m __4__

17) 8200 km __2__

18) 0.00705 dm __3__

Round off each of the following numbers to 2 significant figures.

19) 115 ___120_____

20) 37,500 _38,000____

21) 0.47322 __0.47_____

22) 55.6 ___56______

23) 1,557,000 _1,600,000_

Perform the following operations expressing the answer in the correct number of significant figures.

24) 1.35 m x 2.467 m = ___3.33 m²___

25) 55.46 g – 28.9 g = ___26.6 g_____

26) 150 L³ / 4L = ___40 L²______

27) 12.01 mL + 35.2 mL +6 mL = ___53 mL_____

28) 1.252 mm x 1.15 mm x 0.012 mm = __0.017 mm³_