All integers have factors. Some integers have some of the same factors as other integers. These are known as common factors.
3 is a common factor of 6 and 9.
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All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors because they are factors that the numbers have in common. 3 is a factor of 12. 3 is a factor of 15. 3 is a common factor of 12 and 15.
When two or more numbers have one or more of the same primes as factors, those prime factors are called common prime factors. For example, the prime factors of 6 are 2 and 3, and the prime factors of 21 are 3 and 7, so 3 is a common prime factor of 6 and 21.
The common factors are 1 and 3. The greatest of these is 3.
What are the common factors for 14 and 22
The highest common factor is 5