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Question 1 of 6
medium
The HCF of two different prime numbers is always…
Explanation: Different primes share only the factor 1.
Question 2 of 6
hard
HCF of 18 and 24 = ?
Explanation: Common factors 1, 2, 3, 6 → highest is 6.
Question 3 of 6
hard
Which number has exactly 3 factors?
Explanation: 9 has factors 1, 3, 9 (a square of a prime has exactly 3 factors).
Question 4 of 6
medium
How many factors does 24 have?
Explanation: 1, 2, 3, 4, 6, 8, 12, 24 → eight factors.
Question 5 of 6
medium
Which of these is NOT prime?
Explanation: 33 = 3 × 11, so it is composite.
Question 6 of 6
medium
How many prime numbers are there between 10 and 20?
Explanation: 11, 13, 17, 19 → four primes.
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