30
15,2
5,3,2
Since 60 is a factor of 360, it is automatically the GCF.
83 is prime. No tree.
5 is a common factor of 25 and 60.
61 is already prime. It doesn't need a tree.
The greatest factor is 72 which is a factor of 72 (though not of 60).
Because 45 is not a factor of 60.
60 30,2 15,2,2 5,3,2,2
60 30,2 15,2,2 5,3,2,2
60 30,2 15,2,2 5,3,2,2
60 30,2 15,2,2 5,3,2,2
30,2 15,2,2 5,3,2,2
45 doesn't divide into 60 evenly.
Because 45 is not a factor of 60.
45 doesn't divide into 60 evenly.
as you can obviously see the bottom of a factor tree would be the curious numbers of 2,2,3,5
use a factor tree
24 12,2 6,2,2 3,2,2,2 60 30,2 15,2,2 5,3,2,2