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.
The highest common factor is 5
The prime factors of 18 are 2, 3, and 3. The prime factors of 90 are 2, 3, 3, and 5. The prime factors they have in common are 2, 3, and 3. Since 18 is a factor of 90, its prime factors will be the prime factors that the two numbers have in common.