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It is three.

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Q: What are the greatist common factors of 6 and 21?
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What are all the common factors of 9 21 and 63?

The common factors of 6, 21, and 39 are 1 and 3


What number is a common factor of 21 and 42?

The factors of 21 are: 1, 3, 7, 21.The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42.The common factors are: 1, 3, 7, 21


What common factors do 6 12 21 share?

1 and 3


What are the common factors of 84 and 198?

The factors of 21 are: 1, 3, 7, 21.The factors of 84 are: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84.The common factors are: 1, 3, 7, 21


What does common prime factors mean?

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.

Related questions

What are the common factors of 6 and 21?

The common factors of 6 and 21 are 1 and 3.


What is the greatist common factor for 6 and 8?

2


Common factors of 6 and 21?

The factors of 6 are 1, 2, 3, and 6. The factors of 21 are 1, 3, 7, and 21. The common factors of 6 and 21 are 1 and 3, and the GCF is 3.


What is the common factor for 6 and 21?

6 factors into [2 3] 21 factors into [3 7] Common factor is [3]◄


What are all the common factors of 9 21 and 63?

The common factors of 6, 21, and 39 are 1 and 3


What are the common factors of 6 21 and 30?

The common factors of 6, 12, and 30 are 1 and 3


What are the common factors for 6 and 21?

1 and 3


Common factors of 18 and 21?

The factors of 21 are 1, 3, 7 and 21. The factors of 18 are 1, 2, 3, 6, 14 and 18. Therefore the common factors are 1 and 3.


What number is a common factor of 21 and 42?

The factors of 21 are: 1, 3, 7, 21.The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42.The common factors are: 1, 3, 7, 21


What are the common factors and greatest common factor of 21 and 5 6?

The common factors are 1 and 7. The GCF is 7.


What are the common factors of 6 12 and 21?

1 and 3


What are the greatest common factors of the numbers 21 and 6?

3