The least common factor is: 1
2
The GCF is 5.
They are 1 and 5
10 is the greatest common factor
The GCF is 10.
The GCF is 2.
The GCF is 2.
The GCF is 1.
The GCF is 2.
Since 2 is a factor of 10, it is automatically the GCF.
Their least common multiple is 40