Module 2 Pretest Homework Packet Answers

Module Two-Part B: Rounding Off & Arithmetic Operations of Sign. Figures 5 points

 

Round off the following numbers to three significant figures:

 

(1) 1.598 x 106 = ___1.60 x 106 _

 

 

(2) 0.000 000 484 500 = __0.000 000 485 ___or__4.85 x10-7_

 

 

(3) 0.01045 = __0.0105 __or__1.05 x 10-2____

 

 

(4) 1.98754 X10-7 = __1.99 X10-7 ________

 

Perform the following addition/subtraction/multiplication/division operations and express the answer using the proper units and significant figures:

 

(5) 4 mL

16.3 mL

+ 0.953 mL

21.253 mL = 21 mL

 

 

(6) 376.5 mL

- 76 mL

300.5 mL = 301 mL

 

(7) 16.5 cm

X 1.7 cm

28.05 cm2 = 28 cm2

 

 

(8) 12.0 g 1.00 g = 12.0

or

12.0 g / 1.00 g = 12.0

 

 

(9) 9.2 cm X 9.20 cm X 3.14 X 22.65cm = 6019.68 cm3 = 6.0 x 103 cm3

 

 

(10) (5398 cm3 2060.2 cm3) /16.8 cm3/sphere = 3338 cm3 / 16.8 cm3/sphere =

 

198.69 spheres = 199 spheres

 

 

 

Additional Homework (not required) for your practice:

Corwin 7th edition:

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