Answer:
The answer is 90.
Explanation:
Find the greatest common factor of 270 and 360.
270 = 3 x 3 x 3 x 2 x 5 or in exponent form :

360 = 3 x 3 x 2 x 2 x 2 x 5 or in exponent form :

As we can see that the greatest common factor is = 3 x 3 x 2 x 5 = 90 or in exponent form this can be written as :

Therefore, the greatest common factor is 90.