What is the greatest common factor of 63 and 42?

Answer 1

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

Answer 2

63 / 42 = 1 r 21

42 / 21 = 2 r 0

gcf of 63 and 42 is 21.

Answer 3

The HCF is 21.

Answer 4

21.