Greatest common factor of 100 and 49?

Answer 1

1

The factor pairs of 100 are 1 and 100, 2 and 50, 4 and 25, 5 and 20, and 10 and 10.

The factor pairs of 49 are 1 and 49, and 7 and 7.

Since the only factor they share is 1, 1 is their greatest common factor.