Class 7 Maths Chapter 6 Extra Questions with Answers

Q1. What is a prime number?
Answer: A prime number is a number that has exactly two factors: 1 and itself.

Q2. Is 37 a prime number?
Answer: Yes.

Q3. Is 45 a prime number?
Answer: No.

Q4. Write the prime factors of 36.
Answer: 2 × 2 × 3 × 3

Q5. What is the HCF of 18 and 24?
Answer: 6

Q6. What is the LCM of 12 and 18?
Answer: 36

Q7. Which number is divisible by both 2 and 5?
Answer: A number ending in 0.

Q8. Is 252 divisible by 9?
Answer: Yes, because 2 + 5 + 2 = 9.

Q9. What is the smallest prime number?
Answer: 2

Q10. Which is the only even prime number?
Answer: 2

Q11. Is 1 a prime number?
Answer: No.

Q12. Write the first five prime numbers.
Answer: 2, 3, 5, 7, 11

Q13. Find the HCF of 20 and 30.
Answer: 10

Q14. Find the LCM of 8 and 12.
Answer: 24

Q15. Why is prime factorization useful?
Answer: It helps in finding the HCF, LCM, and solving many mathematical problems easily.

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