The common factors of 12, 24 and 36 are

The common factors of 12, 24 and 36 are

1,2,3,4,6,12.
Six in all
I hope I can help you

The greatest common factor of 19 and 21

1

19 and 23 greatest common factor
What about 84 and 56?

19 and 23 are coprime
So the greatest common factor is 1

What is the greatest common factor of 19 and 20______ What is the greatest common factor of, 8 and 40______ What is the greatest common factor of, 18 and 12______ ．

19 and 20 are coprime numbers, the greatest common factor is 1, 5 times of 8 is 40, the greatest common factor of 8 and 40 is 8, 18 = 2 × 3 × 3, 21 = 2 × 2 × 3, the greatest common factor of 18 and 12 is 2 × 3 = 6