It is 30 because it's the highest common factor of 60 and 90
The GCF of 60 and 90 is 30.
The HCF would be 6
There are infinitely many pairs. One possible pair is 30 and 60.
The HCF of 4 and 90 is 2.
The HCF of 12 and 60 is 12
The GCF is 30.
HCF(160, 90) = 10.
The GCF is 6.
The GCF is 20.
The GCF is 12.
The GCF is 4.