what is the greatest common factor for 39 and 57?
a)19
b)13
c)7
D)3
Start by finding the prime factorization of each. Then you can find which prime factors the two composite numbers have in common, which leads to the GCF.
To find the greatest common factor (GCF) of 39 and 57, you can list the factors of each number and find the largest one that they have in common.
Factors of 39: 1, 3, 13, 39
Factors of 57: 1, 3, 19, 57
From the lists, we can see that the greatest common factor of 39 and 57 is 3.
Therefore, the answer is D) 3.
To find the greatest common factor (GCF) of two numbers, you need to determine the largest number that divides both numbers evenly. In this case, we have 39 and 57.
One way to find the GCF is to list out the factors of each number. The factors of 39 are 1, 3, 13, and 39. The factors of 57 are 1, 3, 19, and 57. We can see that the common factors are 1 and 3.
To identify the greatest common factor, you need to determine the largest number in the list of common factors. In this case, the greatest common factor is 3.
Therefore, the answer is D) 3.