Answer:
8
Step-by-step explanation:
First find all factors of 72 and 64 and put them in their respective circles
The factors of 72: 1,2,3,4,6,8,9,12,18,24,36,72
The factors of 64: 1,2,4,8,16,32,64
Now find the factors that both numbers share.
Common factors: 1,2,4,8
The greatest common factor of 72 and 64 is 8.
