### Possible Answer

Example: Find the GCF of 20, 50 and 120. The factors of 20 are 1, 2, 4, 5, 10 ... of 18 and 27 are 3 and 3. So, the greatest common factor of 18 and 27 is 3 x 3 = 9. - read more

A quick survey of the factors indicates the GCF of 18 and 24 must be 6 ... Since 20 is the largest number common to both lists, the GCF of 40 and 60 is 20. d. - read more

Please vote if the answer you were given helped you or not, thats the best way to improve our algorithm. You can also submit an answer or search documents about what is the lcm and gcf of 18 and 20.