21 and 80's highest common factor is one.
The highest common factor is 7.
The highest common factor is 3.
The GCF is 7.
Highest common factor of 273 and 315 is 21.
The highest common factor of (3,21) =3
The highest common factor is 7
The GCF is 21.
The highest common factor of 18 and 21 is 3
The highest common factor is 7.
The highest common factor of 21 and 24 is 3.
The GCF (greatest common factor) would be 21.