What is the HCF of 15 and 25?
- A.3
- B.5 ✓
- C.10
- D.15
Explanation: Factors of 15: 1,3,5,15. Factors of 25: 1,5,25. Common factors: 1,5 — HCF is 5.
Class 6 IMO Mathematics Olympiad practice · Number Sense · Factors, Multiples & Primes
← All Factors, Multiples & Primes questions