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An HCF is the product of any common prime factors of two numbers. If two numbers have no common prime factors, then the HCF will be 1.
For example, 10 and 21. The prime factors are 2x5 and 3x7. There is nothing in common, and so the HCF of 10 and 21 is 1.
Two consecutive numbers will always have the HCF of 1.
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Earn +20 ptsQ: What numbers have an HCF of 1?
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What is the HCF of 16 and 3?
The GCF is 1.
What is the HCF of 24 and 5?
The GCF is 1.
What is the HCF of 26 and 45?
HCF(26, 45) = 1. The numbers are co-prime.
What goes into 63 and 8?
The HCF of both numbers is 1
Can the HCF of two numbers be a factor of their LCM?
The HCF is always a factor of the LCM of two numbers. The HCF is a factor of both the numbers which are factors of their LCM. Thus the HCF is also a factor of the LCM of the two numbers.
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