Using Significant Figures



Using Significant Figures

Determine the number of significant digits in each of the following:

1) 23.30 cm 2) 1,843.02 L 3) 2.00012 km 4) 3.65 kg 5) 8.701oC

6) 0.5 mL 7) 365 kg 8) 2000.12 mm 9) 704,000 h

Round these numbers to 3 significant digits.

10. 1,566,311

10)

12) 2.7651 X 10 -3

11) 84,592

13) 0.0011672

Report answers to the following problems using proper significant figures and units:

14) 3.414 s + 10.02 s + 58.325 s + 0.00098 s

15) 2.326 h – 0.10408 h

16) 10.19 m x 0.013 m

17) 80.23 m / 2.4 s

18) 4.301 kg / 1.9 cm3

19) 63.2 mm + 104.17 mm

20) 140.01 cm x 26.042 cm x 0.0159 cm

21) 9.583 x 10-2 in2 / 4.23 x 10-4 in

Perform the following calculations, and express the results in the correct units and with the proper number of significant figures.

22) (0.054 kg +1.33 kg) x 5.4 m2

23) 67.35 cm2 / (1.401 cm - 0.399 cm)

24) 3.14159 m x (4.17 m + 2.150 m)

25) 690 000 m / (5.022 h - 4.31 h)

26) (3.12 cm + 546.1 cm) / 62.101 min

27) (56.154 mL - 8.74 mL) / 5 g

Percent Error Practice

28) Samantha S. Sloppiness measured the volume of her soda before she drank it for her midmorning snack. She measured the volume to be 14 oz. The label on the bottle says the volume is 12 oz. Calculate Samantha’s percent error.

29) Clyde Clumsy was directed to weigh a 500. g mass on a balance. After diligently goofing off for ten minutes, he quickly weighed the object and reported it to be 458 g. What was Clyde’s percent error?

30) Pretty Patty Pestilence had casually recorded her grades in her notebook. She recorded that she earned 250.0 points, while Miraculous (her Chem teacher) determined that she actually had 225.0 points. What was Patty’s percent error?

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