Question

What is the greatest common factor of 30 and 75?
OA) 25
OB) 15
OC) 5
OD) 3

Answer 1

Answer: 15

Step-by-step explanation

Let's look at the prime factorization of each given value. A factor tree could be helpful.

30 = 2*3*5

75 = 3*5*5

Each prime factorization has a 3 and a 5 as well. In other words, each has 3*5 to give the GCF to be 15.