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Quiz Chapter 2: Factors and Multiples

10 questions · Form 1 Mathematics Bab 2: Factors and Multiples

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. Which of the following numbers is NOT a factor of 36?

  1. 8
  2. 4
  3. 6
  4. 9
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Answer: A

36 ÷ 8 = 4.5 (leaves a remainder). Thus, 8 is not a factor of 36.

2. Determine the Lowest Common Multiple (LCM) of 3, 5, and 6.

  1. 30
  2. 15
  3. 60
  4. 90
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Answer: A

Using repeated division or listing, the smallest number divisible by 3, 5, and 6 is 30.

3. Find the Highest Common Factor (HCF) of 12 and 18.

  1. 6
  2. 3
  3. 12
  4. 36
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Answer: A

Factors of 12: 1, 2, 3, 4, 6, 12. Factors of 18: 1, 2, 3, 6, 9, 18. The highest common factor is 6.

4. If the HCF of two numbers is 6 and their LCM is 36, and one of the numbers is 12, what is the other number?

  1. 18
  2. 24
  3. 30
  4. 9
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Answer: A

Formula: Number A × Number B = HCF × LCM. 12 × B = 6 × 36 = 216. B = 216 ÷ 12 = 18.

5. Which of the following statements is FALSE?

  1. 1 is a prime number
  2. 2 is the only even prime number
  3. All multiples of 10 end with 0
  4. The smallest factor of any whole number is 1
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Answer: A

1 is neither a prime nor a composite number because it only has one factor.

6. Express 72 as a product of its prime factors.

  1. 23 x 32
  2. 22 x 33
  3. 2 x 34
  4. 24 x 3
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Answer: A

72 = 8 × 9 = (2 × 2 × 2) × (3 × 3) = 23 × 32.

7. Two red lights flash at intervals of 4 seconds and 6 seconds respectively. If they flash together now, after how many seconds will they flash together again?

  1. 12 seconds
  2. 24 seconds
  3. 10 seconds
  4. 16 seconds
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Answer: A

Find the LCM of 4 and 6. LCM(4, 6) = 12 seconds.

8. Find the Highest Common Factor (HCF) of 16, 24, and 32.

  1. 8
  2. 4
  3. 16
  4. 2
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Answer: A

Using repeated division: 16 ÷ 8 = 2, 24 ÷ 8 = 3, 32 ÷ 8 = 4. Since 2, 3, 4 share no common factors, HCF = 8.

9. Which of the following is a common factor of 18 and 24?

  1. 6
  2. 8
  3. 9
  4. 12
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Answer: A

Factors of 18: 1, 2, 3, 6, 9, 18. Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24. Shared factors are 1, 2, 3, and 6.

10. Find the Lowest Common Multiple (LCM) of 6 and 8.

  1. 24
  2. 48
  3. 14
  4. 16
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Answer: A

Multiples of 6: 6, 12, 18, 24... Multiples of 8: 8, 16, 24... The smallest common multiple is 24.

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