HCF & LCM · Question 1 · Easy
What is the HCF of 84, 126 and 210?
- 21
- 14
- 42
- 84
Answer and explanation
Answer: C. 42
Explanation: 84 = 2^2 × 3 × 7, 126 = 2 × 3^2 × 7, 210 = 2 × 3 × 5 × 7. Common factors give HCF = 2 × 3 × 7 = 42.
Next: What is the LCM of 12, 18 and 30?
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