For this case we have that by definition, the Greatest Common Factor or GFC of two or more numbers, is the largest number that divides them without leaving residue.
So:
We look for the factors of 18 and 36:
18: 1,2,3,6,9,18
36: 1, 2,3,4, 6,9,18 ...
Thus, the GFC of both numbers is 18.
Then, the GFC of
and
is:
![18x](https://img.qammunity.org/2020/formulas/mathematics/middle-school/rn20spu4ror12xgmg7qgck4pmgo389r445.png)
Answer:
![18x](https://img.qammunity.org/2020/formulas/mathematics/middle-school/rn20spu4ror12xgmg7qgck4pmgo389r445.png)