Grade 8 Unit 2
Common Assessment Questions
1. Simplify the following expression:
A.
B.
C.
D.
2. As Uranus orbits the Sun, the distance from its closest point to the Sun, or its perihelion, is 1703 million
miles. The distance from its farthest point, or its aphelion to the Sun, is 1.866 × 109 miles. What is the
difference in these distances?
A. 1.63 × 108 miles
B. 163 × 108 miles
C. 1.701 × 109 miles
D. 1701 × 109 miles
3. The Moon is 3.844 × 105 km from Earth. If a spaceship were traveling from Earth to the Moon at an average
speed of 5,400 km per hour, approximately how many hours would it take the spaceship to reach the Moon?
A. 7.1 hours
B. 71 hours
C. 710 hours
D. 7,100 hours
4. The expression
is equivalent to
A.
B.
C. x * x * x
D.
5. Use the laws of exponents to evaluate
A.
B.
C. 7
D. 49.
when x = 7 and n = 2.
6.
Cybil worked on a problem which required her to simplify the expression
Her result was
What value is
equivalent to
A. 12
B. 32
C. 36
D. 64
7.
In the year 2000, there were approximately 9,500,000 people in Los Angeles County, California. What is 9,500,000 written
in scientific notation?
A.
B.
C.
D.
8.
Which is equivalent to 4–3?
A.
B.
C.
D.
9.
Which expression is equivalent to (22)3 × 2–2?
A. 2–12
B. 24
C. 23
10. A cube has a volume of 8 ft3. What is the length of one side of the cube?
A. 4 ft
B.
2 ft
C. 1 ft
11. What is 0.036 expressed in scientific notation?
A. 3.6 × 10–2
B. 3.6 × 10–1
C. 3.6 × 101
D. 3.6 × 102
12.
According to the 2010 national census, the total population of the United States was approximately
population of a town was approximately
than the population of the town?
A.
3
B.
300
C.
3,000
D.
30,000
people. The total
people. The population of the United States was how many times greater
13. The number of fish in Lake Bass is about 1.2 × 106. The number of fish in Lake Simon is about 6 × 103. How much larger is the
number of fish in Lake Bass than the number of fish in Lake Simon?
A. 2 times larger
B. 20 times larger
C. 200 times larger
14. What is the value of (5 × 104) – (2 × 103)?
A. 4.8 × 104
B. 4.8 × 101
C. 3 × 104
D. 3 × 101
15. Which of the following is equivalent to 0.00000073?
A.
B.
C.
D.
The mass of Jupiter is approximately
kilograms, while the mass of the Earth is approximately
16. kilograms. The mass of Jupiter is approximately how many times the mass of the Earth?
A. 0.318
B. 3.18
C. 318
D. 3180
17.
Chemists define a mole of a compound as
in
molecules?
A.
2 moles
B.
5 moles
C.
20 moles
D.
50 moles
molecules of that compound. How many moles are