Unit 2 · Class 8 IB MYP · MCQ Test
Scientific Notation MCQ Test — Class 8 IB MYP
Practice 10 multiple-choice questions with instant answer reveal and explanations.
Scientific Notation — MCQ Questions
1Express 3000 in scientific notation.
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Answer: \(3 \times 10^3\)
Hint: Move the decimal point until you have a number between 1 and 10.
Solution:
Move the decimal 3 places to the left. — 3000 = 3 \times 10^3
2Express 0.005 in scientific notation.
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Answer: \(5 \times 10^{-3}\)
Hint: For small numbers, the exponent of 10 will be negative.
Solution:
Move the decimal 3 places to the right. — 0.005 = 5 \times 10^{-3}
3What is \(4.5 \times 10^2\) in standard form?
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Answer: 450
Hint: Multiply by 10 twice (move decimal 2 places right).
Solution:
Move the decimal 2 places to the right. — 4.5 \times 10^2 = 450
4Express 72,000 in scientific notation.
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Answer: \(7.2 \times 10^4\)
Hint: The coefficient must be between 1 and 10.
Solution:
Move the decimal 4 places to the left. — 72{,}000 = 7.2 \times 10^4
5What is \(6 \times 10^{-1}\) in standard form?
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Answer: 0.6
Hint: A negative exponent means move the decimal to the left.
Solution:
Move the decimal 1 place to the left. — 6 \times 10^{-1} = 0.6
6Express 500,000 in scientific notation.
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Answer: \(5 \times 10^5\)
Hint: Count how many places you move the decimal to get a number between 1 and 10.
Solution:
Move the decimal 5 places. — 500{,}000 = 5 \times 10^5
7What is \(1.2 \times 10^3\) in standard form?
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Answer: 1200
Hint: Move the decimal 3 places to the right.
Solution:
Multiply 1.2 by 1000. — 1.2 \times 10^3 = 1200
8Express 0.0042 in scientific notation.
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Answer: \(4.2 \times 10^{-3}\)
Hint: Move the decimal right until you get a number between 1 and 10.
Solution:
Move the decimal 3 places to the right. — 0.0042 = 4.2 \times 10^{-3}
9Which of the following is in correct scientific notation?
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Answer: \(8.1 \times 10^{-2}\)
Hint: In scientific notation, the coefficient must be at least 1 and less than 10.
Solution:
Check each option: 12.5 is too large, 0.7 is too small, 100 is too large. — 8.1 \text{ is between 1 and 10, so } 8.1 \times 10^{-2} \text{ is correct.}
10What is \(9 \times 10^0\)?
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Answer: 9
Hint: Any number raised to the power 0 is 1.
Solution:
Since \(10^0 = 1\): — 9 \times 10^0 = 9 \times 1 = 9
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Tips for Scientific Notation MCQs
- 1Read each question carefully and identify what is being asked before looking at the options.
- 2Try to solve the problem mentally or on paper first, then match your answer with the options.
- 3Use elimination — rule out clearly wrong options to improve your chances even when unsure.
- 4Check units, signs, and edge cases — these are common traps in Scientific Notation MCQs.
- 5Review your mistakes after completing the test to build lasting understanding.
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