Multiples, Factors, Prime Numbers and Prime Factorization including LCM and GCF

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1.5Multiples, Factors, Prime Numbers and Prime Factorization including LCM and GCF

Multiples, Factors, Prime Numbers and Prime Factorization including LCM and GCF Revision Questions

1. Which of the following numbers is a multiple of 13?

  1. 69
  2. 1/13
  3. 52
  4. 102

Correct Answer: C

2. How many factors does the number 24 have?

  1. 8
  2. 7
  3. 6
  4. 5

Correct Answer: A

3. The number 54 written as a product of prime factors is ...............

  1. 22 × 32
  2. 2 × 33
  3. 2 × 3 × 9
  4. 6 × 32

Correct Answer: B

4. The number 22 × 3 × 52 corresponds to ...............

  1. 300
  2. 200
  3. 900
  4. 120

Correct Answer: A

5. Which of the following numbers is a common multiple of 16 and 20?

  1. 36
  2. 60
  3. 160
  4. 300

Correct Answer: C

6. What is the least common multiple of 54 and 81?

  1. 27
  2. 81
  3. 108
  4. 162

Correct Answer: D

7. What is the greatest common factor of 32 and 48?

  1. 8
  2. 12
  3. 16
  4. 24

Correct Answer: C

8. What is LCM and GCF of 8, 16 and 24?

  1. LCM = 8; GCF = 24
  2. LCM = 24; GCF = 8
  3. LCM = 48; GCF = 4
  4. LCM = 24; GCF = 4

Correct Answer: B

9. Which of the following numbers is NOT prime?

  1. 41
  2. 73
  3. 87
  4. 103

Correct Answer: C

10. A 30 km × 18 km military base has to be surrounded in its outer border by observation towers that must be equidistant from each other. What is the maximum distance these towers must have from each other?

  1. 6 km
  2. 9 km
  3. 12 km
  4. 90 km

Correct Answer: A

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