The common factors are: 1, 2, 4.
The common factors of 65 and 600 are: 1 and 5
The common factors of 28 and 84 are 1,2,4,7,14 and 28
The common factors of 28 and 84 are 1,2,4,7,14 and 28.
The factors of 28 are 1,2,4,7,14 and 28. "Common" means "same for both". For these factors to be common, they need to be compared to the factors of another number.
Since 300 is a factor of 600, all of its factors are common.
The common factors of 28 and 63 are: 1 and 7
The common factors of 28 and 49 are 1 and 7.
The common factors of 18 and 28 are 1 and 2
Common factors of 28 and 30 are: 1 and 2.
The common factors of 28 and 50 are 1 and 2
The common factors are: 1, 2.
The common factors of 14 and 28 are 14,7,2,1.