3- 1 & 3
12- 1, 2, 3, 4, 6, & 12
1 and 3
The common factors are: 1, 2, 3, 6
1, 2, 3, 61, 2, 3, 4, 6, 12
1, 2, 3, 4, 6, 12 1, 37
1,2,4,8,16 1,2,3,4,6,12
1, 2, 3, 6 1, 2, 3, 4, 6, 12
2 and 4
4
36
The factors of 8 are: 1, 2, 4, 8.The factors of 12 are: 1, 2, 3, 4, 6, 12.The common factors are: 1, 2, 4
Since 12 is a factor of 72, all of its factors are common.
3