The GCF is 18.
They are 18, 36, 54, 72, 90, 108, 126, 144 and 162.
Here are the first 10: 18, 36, 54, 72, 90, 108, 126, 144, 162, 180 . . .
1, 2, 3, 6, 9, 18, 27, 54 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72 1, 2, 3, 6, 9, 18, 27, 54, 81, 162
18 and 36 do. So do 18 and 54, 36 and 54, 18 and 72, 54 and 72, and an infinite number of other pairs of numbers.
18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, . . . 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, . . .
The GCF/HCF of 54 and 504 is 18.
18, 36, 54, 72, 90, 108, 126, 144, 162, etc.
18, 36, 54, 72, 90, 108, 126, 144, 162, 180 . . .
The HCF of 48 and 72 is 24. The LCM is 144.
The GCF is 18.
The GCF is 72.
Hcf of 24 and 72 is 24