The factors of 10 are 1, 2, 5, and 10.
There's no such thing as the GCF of a single number,
only of two or more.
10
The GCF of 25 and 10 is 5.
10
Only if you're comparing a number to itself. The GCF and LCM of 10 and 10 is 10.
4.
15
It is: 5
It is: 6
It is 15
7
It is just 1
1