Answer:
3
Step-by-step explanation:
The factors of 18 = 2, 3, 3,
The factors of 72 = 2, 2, 2, 3, 3,
So the highest facor they both share is 3
The GCF of 18 and 72 would be 3.
Since 3 is the highest number that goes into both 18 & 72.
Hope this helps,
Davinia.
