Top Answer

The greatest common factor (GCF) of 42 and 63 is 21.

To find the GCF (greatest common factor) of two numbers, first prime factorize them.

42 = 2*3*7

63 = 3*3*7

The GCF must be able to contain factors such that if divided by 42 or 63, the answer will be an integer.

The GCF is 21.

21

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The Greatest Common Factor of 28, 42, 63: 7

The Greatest Common Factor of 105, 63, 42: 21

The greatest common factor of 63, 28 and 42 is: 7

21

The Greatest Common Factor is seven.

three

7

7

The GCF is 21.

7

7

7

It is: 3

The HCF is 21.

It is: 7

The GCF of 15, 42, and 63 is: 3It is: 3

The greatest common factor is 21

The GCF is 21.

The GCF is 21.

The GCF is 21.

The GCF is 21.

The GCF is 7.

The GCF is 7.

The GCF is 7.

The GCF is 7.