The numbers are: 12 and 72
12 and 8
6 and 18
12 57
12 and 144
LCM(12, 18, 24) = 72; GCF(12, 18, 24) = 6.
If the GCF of two numbers is 12 and the LCM is 24, the two numbers are 12 and 24.
You need at least two numbers to find a GCF or an LCM and the LCM of those numbers can never be less than the GCF. 12 and 360 have a GCF of 12 and an LCM of 360. So do 60 and 72.
3 and 12
3 and 12
12 and 252
12 and 648
You need at least two numbers to find either of those.
12 and 20
12 and 396 36 and 132
60 and 36
Gcf = 2 LCM = 132
12 and 8