What is the Highest Common Factor (HCF) of 20 and 30?
What is the Highest Common Factor (HCF) of 20 and 30?
Explanation
Factors of 20: 1, 2, 4, 5, 10, 20
Factors of 30: 1, 2, 3, 5, 10, 15, 30
Common factors: 1, 2, 5, 10
Highest common factor = 10
Factors of 20: 1, 2, 4, 5, 10, 20
Factors of 30: 1, 2, 3, 5, 10, 15, 30
Common factors: 1, 2, 5, 10
Highest common factor = 10