What is the greatest common factor of 45 90 and 120?

Oh, what a happy little math question we have here! To find the greatest common factor of 45, 90, and 120, we first list the factors of each number. The greatest common factor is the largest number that divides evenly into all three numbers. So, the greatest common factor of 45, 90, and 120 is 15. Just like painting, math is all about finding harmony and balance!