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Earn +20 ptsQ: Is it possible for two numbers to have no common factors?
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What are two numbers that have no common factors?
40 and 21 have no common prime factors
If two is not a common factor of a pair of numbers what other numbers cannot be common factors?
Even numbers.
What numbers have an HCF of 1?
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.
Are 6 and 8 coprime numbers?
No. If two numbers are coprime, they must have no common factors.
What is the least common factor of 3510?
There cannot be a greatest common factor of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
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