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:
Page 25: #15-#18; #19-#22; #23-#26