Common factors of 28 and 30 are: 1 and 2.
1,2,4,7,14,28 1,2,3,5,6,10,15,30
The factors of 28 are: 1, 2, 4, 7, 14, 28 The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30 The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42
The common factors are: 1, 2
20 and 28 both have six factors.
20 and 28 both have six factors.
28
The factors of 28 are 1, 2, 4, 7, 14, 28 The factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
The GCF of 28 and 30 is 2. The GCF of 30 and 28 is 2 because if you divide them each by 2, then you are left with 15 and 14 and they don't share any factors other than 1.
28.
28. The sum of its factors (smaller than 28) is 1 + 2 + 4 + 7 + 14 = 28.
2,2,7 are the factors of 28.