The GCF is 1.
Multiply grouped, common, prime factors to get the GCF: 25 = 5 * 5 75 = 3 * 5 * 5 115 = 5 * 23 GCF = 5
The GCF of two prime numbers is always 1. 3 and 5 are both prime numbers so, GCF (3, 5) = 1.
The GCF of 6 and 15 is 3. 6/15 = 2/5
The GCF of 30 and 55 is 5.The prime factorization of 30 is 2*3*5.The prime factorization of 55 is 5*11Therefore, the GCF of 30 and 55 is 5.
The GCF is 1.
75 = 3 * 5 * 5 and 285 = 3 * 5 * 19 they have in common ( 3 * 5) So the GCF is 15.
The GCF is 1.
3 = 1 x 3 5 = 1 x 5 7 = 1 x 7 GCF = 1
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The systematic way to get the answer is: 90 = 2*3*3*5 210 = 2*3*5*7 So gcf is 2*3*5 = 30
GCF (125, 80, 225) = 5
You need at least two numbers to find a GCF. If that's 3 and 15, the GCF is 3.
The GCF is 1.