The common factors are: 1, 2, 4, 7, 14, 28.
The common factors of 288 and 420 are 1, 2, 3, 4, 6 and 12.
The common factors of 420 and 880 are: 1, 2, 4, 5, 10, 20.
The common factors of 24 and 420 are: 1, 2, 3, 4, 6, and 12
The common factors of 56 and 18 are 1 and 2.
The common factors of 38 and 56 are 1 and 2.
3
Since 28 is a factor of 56, all of the factors of 28 are common to 56.
The common factors of 52 and 56 are: 1, 2, and 4
The common factors of 63 and 56 are: 1, 7
The common factors of 12 and 56 are: 1, 2, and 4
Since 4 is a factor of 56, all of its factors are common.
The common factors of 34 and 56 are 1 and 2