The HCF of 70, 42, 28 is?
The HCF of 70, 42, 28 is?
Explanation
Factors of 70: 1, 2, 5, 7, 10, 14, 35, 70
Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42
Factors of 28: 1, 2, 4, 7, 14, 28
Common factors: 1, 2, 7, 14 → Highest is 14
So, HCF = 14.
Factors of 70: 1, 2, 5, 7, 10, 14, 35, 70
Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42
Factors of 28: 1, 2, 4, 7, 14, 28
Common factors: 1, 2, 7, 14 → Highest is 14
So, HCF = 14.