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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

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13y ago
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9y ago

Since 21 is a factor of 42, all of its factors are common.

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Q: What number is a common factor of 21 and 42?
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Related questions

What is the greatest common factor for 63 42 and 21?

The Greats Common Factor (GCF) is 21 63: 1,3,7,9,21,63 42: 1,2,3,67,14,21,42 21: 1,3,7,21 They all number 21 listed in there the Factors


What are the common factors and greatest common factor of 21 and 42?

The common factors of 21 and 42 are 3, 7 and 21. The greatest common factor (GCF) is 21.


Which number is not a common factor of 42 and 21?

Everything except 1, 3, 7 and 21.


What is the greatest common factor 21 and 42?

Since 21 is a factor of 42, it is automatically the GCF.


What is the greatest common factor for 42 and 21?

21 itself is the greatest common integral factor, since 21 X 2 = 42.


What are the common factor of 42 and 63?

A factor is a divisor - a number that will evenly divide into another number. One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them. The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42. The factors of 63 are 1, 3, 7, 9, 21, and 63. The common factors are 1, 3, 7, and 21.


What is the largest factor of 21 and 42 have in common?

21 is.


What is the greatest common factor of 42 and 105?

A factor is a divisor - a number that will evenly divide into another number. The greatest common factor of two or more numbers is the largest factor that both numbers have in common.One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them.The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42.The factors of 105 are 1, 3, 5, 7, 15, 21, 35, and 105.The common factors are 1, 3, 7, and 21. Therefore, the greatest common factor is 21.The GCF of 42 and 105 is 21


What is the common factor of 14 and 21?

42 * * * * * 42 is a common MULTIPLE, not a common factor. The two common factors are 1 and 7.


What is the highes common factor of 42 and 63?

The highest common factor is 21


Greatest common factor of 21 and 42?

The GCF is 21.


What is the common factor of 21 42 and 63?

The gcf is 21