1, 3, 5, 15
1, 5, 25
450 is the LCM
The common factors of 45 and 90 are 1,3,5
19 and 90 have no common prime factors.
Since 45 is a factor of 90, all of its factors are common.
The common factors of 90 and 189 are 1, 3 and 9.
The common factors are: 1, 2
The common factors of 90 and 144 are: 1, 2, 3, 6, 9, and 18
The common factors are: 1, 3, 9
The GCF is 90.
The Greatest Common Factor of 20 and 90 is 10, because the factors of 20 are: 20:1,2,4,5,10,20 The factors of 90 are: 90:1,2,3,5,6,9,10,15,18,30,45,90 So, the common factors are 1,2,5,10 10 is the greatest number of them so 10 is the Greatest Common Factor. THE ANSWER IS 10
The common factors are: 1, 3, 5, 15.