Math 9 Module 2
Practice quiz for Module 2
- 1.
Which one of the following shows 13500000 in scientific notation?Note: ^ means the next number is an exponent.so:103 = 10^3
- A.
1.35 x 10^7
- B.
135 x 10^5
- C.
0.135 x 10^4
- D.
1.35 x 10^-7
Correct Answer
A. 1.35 x 10^7Explanation
the decimal needs to be moved 7 places to the left to get to 1.35 - 7 left is written as 10^7 (positive)Rate this question:
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- 2.
True or False?(-3)5 will give a negative answer
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
a negative number to an odd exponent will give a negative answerRate this question:
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- 3.
Use your calculator. Round to 2 decimal places. 35.6 3.2 x 4.5
- A.
50.16
- B.
2.47
- C.
5.60
- D.
49.36
Correct Answer
B. 2.47 -
- 4.
True or false?3-3 = 1 27
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The given statement is false. The subtraction of 3 from 3 is equal to 0, not 1. Therefore, the correct answer is False.Rate this question:
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- 5.
Write as a single power.(32)(33)
- A.
3^6
- B.
9^5
- C.
3^5
- D.
243
Correct Answer
C. 3^5Explanation
The given expression is the product of two powers with the same base, 3. When multiplying powers with the same base, we add the exponents. In this case, the exponent of 3 is 5. Therefore, the simplified expression is 3^5.Rate this question:
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- 6.
Which of the following is NOT written in scientific notation?
- A.
3.4 x 10^5
- B.
3.00 x 10^-10
- C.
2.21 x 10^3
- D.
0.0321 x 10^4
Correct Answer
D. 0.0321 x 10^4Explanation
Scientific notation has the main number between 1 and 10. 0.0321 is less than 1.Rate this question:
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- 7.
Find the value of x. Round to 2 decimal places.
- A.
8.98
- B.
7.21
- C.
10.00
- D.
3.23
Correct Answer(s)
A. 8.98
B. 7.21Explanation
x = square root of (16 + 36)Rate this question:
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- 8.
A square has an area of 36 m2. What is the length of each side?
- A.
30 meters
- B.
9 meters
- C.
6 meters
- D.
25 meters
Correct Answer
C. 6 metersExplanation
length of a square's side = square root of the areaRate this question:
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- 9.
A square has an area of 36 m2.What is the perimeter of the square?
- A.
24 meters
- B.
46 meters
- C.
36 meters
- D.
6 meters
Correct Answer
A. 24 metersExplanation
perimeter = length of side x number of sidesRate this question:
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- 10.
A square has an area of 36 m2.What is the length of the diagonal?
- A.
15m
- B.
10.78m
- C.
6.00m
- D.
8.49m
Correct Answer
D. 8.49mExplanation
diagonal = square root of (36 + 36)Rate this question:
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- 11.
Evaluate:(4a2b3c4)(3ab2c3)
- A.
12a^2b^6c^12
- B.
7a^2b^6c^12
- C.
12a^3b^5c^7
- D.
7a^3b^5c^7
Correct Answer
C. 12a^3b^5c^7Explanation
4x3 = 12
a^2 x a = a^3
b^3 x b^2 = b^5
c^4 x c^ 3 = c^7Rate this question:
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- 12.
Which of the following is the standard form of this number:1.44 x 10-5
- A.
1440000
- B.
0.00000144
- C.
14400000
- D.
0.0000144
Correct Answer
D. 0.0000144Explanation
negative exponent means decimal moves to the right 5 placesRate this question:
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- 13.
4.5 x 107 x 4.5 x 103
- A.
20.25 x 10^10
- B.
9 x 10^10
- C.
20.25 x 10^21
- D.
20.25 x 10^4
Correct Answer
A. 20.25 x 10^10Explanation
4.5 x 4.5 = 20.25
add the exponents = 10^10Rate this question:
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- 14.
2.3 x 10-5 x 3.4 x 107 1.8 x 10-4Round to 2 decimal places
- A.
4.34 x 10^-2
- B.
14.08 x 10^3
- C.
7.50 x 10^-4
- D.
4.34 x 10^6
Correct Answer
D. 4.34 x 10^6Explanation
(2.3 x 3.4)/1.8 = 4.34
Exponent:-5 + 7 - (-4) = 6Rate this question:
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- 15.
Evaluate: 3a2bIf: a=-4 and b=5
- A.
-240
- B.
240
- C.
-120
- D.
120
- E.
3 x (-4x-4) x 5
Correct Answer
B. 240Explanation
The expression 3a2b can be simplified by substituting the given values of a and b, which are -4 and 5 respectively. So, the expression becomes 3 x (-4 x -4) x 5. When we simplify this expression, we get -240. Therefore, the correct answer is -240.Rate this question:
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