Class 8 Maths MCQs on Factors, Multiples and Prime Factorisation
Class 8 Maths MCQs on Factors, Multiples and Prime Factorisation
Class: 8
Subject: Mathematics
Chapter 5: Number Play
Topic: Factors, Multiples & Prime Factorisation
Subject: Mathematics
Chapter 5: Number Play
Topic: Factors, Multiples & Prime Factorisation
Strictly Based on CBSE Curriculum | As per NCERT Textbook | Ideal for CBSE Class 8 Examination Preparation
Q1. A factor of a number is a number that:
Correct Answer: A) Divides the number exactly
Explanation: A factor divides a number without leaving any remainder.
Explanation: A factor divides a number without leaving any remainder.
Q2. Which of the following is a multiple of 12?
Correct Answer: B) 24
Explanation: 12 × 2 = 24, so 24 is a multiple of 12.
Explanation: 12 × 2 = 24, so 24 is a multiple of 12.
Q3. The prime factorisation of 36 is:
Correct Answer: B) 2² × 3²
Explanation: 36 = 2 × 2 × 3 × 3.
Explanation: 36 = 2 × 2 × 3 × 3.
Q4. The factors of 15 are:
Correct Answer: A) 1, 3, 5, 15
Explanation: These divide 15 exactly.
Explanation: These divide 15 exactly.
Q5. Which of the following is a prime number?
Correct Answer: B) 29
Explanation: 29 has only two factors: 1 and 29.
Explanation: 29 has only two factors: 1 and 29.
Q6. The smallest prime number is:
Correct Answer: C) 2
Explanation: 2 is the only even prime number.
Explanation: 2 is the only even prime number.
Q7. The LCM of 4 and 6 is:
Correct Answer: A) 12
Explanation: LCM = 2² × 3 = 12.
Explanation: LCM = 2² × 3 = 12.
Q8. The HCF of 12 and 18 is:
Correct Answer: C) 6
Explanation: Highest common factor is 6.
Explanation: Highest common factor is 6.
Q9. 45 =
Correct Answer: D) All of these
Explanation: All are correct forms.
Explanation: All are correct forms.
Q10. Which number has exactly three factors?
Correct Answer: A) 4
Explanation: Factors of 4: 1,2,4 (3 factors).
Explanation: Factors of 4: 1,2,4 (3 factors).
Q11. Prime factorisation of 60 is:
Correct Answer: A) 2² × 3 × 5
Explanation: 60 = 2 × 2 × 3 × 5.
Explanation: 60 = 2 × 2 × 3 × 5.
Q12. A composite number has:
Correct Answer: B) More than two factors
Explanation: Composite numbers have more than two factors.
Explanation: Composite numbers have more than two factors.
Q13. 17 is:
Correct Answer: B) Prime
Explanation: Only factors 1 and 17.
Explanation: Only factors 1 and 17.
Q14. LCM of 3, 4 and 5 is:
Correct Answer: B) 60
Explanation: LCM = 3 × 4 × 5.
Explanation: LCM = 3 × 4 × 5.
Q15. HCF of 20 and 30 is:
Correct Answer: B) 10
Explanation: Common highest factor is 10.
Explanation: Common highest factor is 10.
Q16. Which is not a factor of 24?
Correct Answer: C) 10
Explanation: 24 ÷ 10 not exact.
Explanation: 24 ÷ 10 not exact.
Q17. 49 is a:
Correct Answer: B) Composite
Explanation: 49 = 7 × 7.
Explanation: 49 = 7 × 7.
Q18. The smallest composite number is:
Correct Answer: C) 4
Explanation: 4 has factors 1,2,4.
Explanation: 4 has factors 1,2,4.
Q19. 81 =
Correct Answer: D) All of these
Explanation: All representations are correct.
Explanation: All representations are correct.
Q20. Prime factorisation helps to find:
Correct Answer: C) Both
Explanation: Prime factors are used to calculate both HCF and LCM.
Explanation: Prime factors are used to calculate both HCF and LCM.
