Best Answer

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

Study guides

☆☆

Q: What is the greatest common factor for 42 and 21?

Write your answer...

Submit

Still have questions?

Continue Learning about Math & Arithmetic

The GCF is 7.

If that's 42, 63 and 84, the GCF is 21.

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

42 prime factors -----> 2,3,7 105 prime factors -----> 3,5,7 There is 3 and 7 in common : There fore 3*7 = 21; 21 is the greatest common factor.

The Greatest Common Factor (GCF) is: 6

Related questions

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

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

7 is the greatest common factor of 4942 and 21, or of 49, 42 and 21, if that is what you meant.

The GCF is 21.

It is: 21

It is: 21

The GCF (greatest common factor) would be 21.

3The GCF is: 2121.The GCF is 21.

21

21

21

The GCF is 21.