The common factors are: 1, 2
Four factors in common.
Four common factors.
The common factors are: 1, 2, 3, 6.
The four common factors are: 1, 3, 17, 51.
The factors of 18 are 1,2,3,6,9 and 18. For them to be common, they need to be compared to another set of factors.
The common factors are: 1, 2, 4, 8, 16
There are only two common factors for 56 and 21. They are 1 and 7.
2 and 1
2
Four of them.
It is four.
The greatest common factor is four.