It doesn't matter if the expression is negative, the greatest common factor will still be positive, since you only count the left side of the ladder. When the left side is mutiplied together, it will be positive, because the negative side is on the right side. Therefore, just keep dividing the negative, but it will not affect the common factor
The GCF of 10 and 15 is 5.
use division by primes to find the gcf
Yes.
5
The GCF is 1.
The GCF of 18 and 57 is 3.
The GCF is 3.
The GCF of 27 and 30 is 3.
2 |10,18 , |_________ 5,9 The GCF is 2.
5 |10,15, |_________2,3The GCF of 10 and 15 is 5.
No matter what you use, you still need at least two numbers to find a GCF.
The prime factorization of 10 is 2 x 5. You need another number to find a GCF or LCM.