Question

85 and 561 is divisible by which common number?

Answer 1

Step-by-step explanation:

The instructions to find the GCF of 85 and 561 are the next:

1. Decompose all numbers into prime factors

85 5 17 17 1 561 3 187 11 17 17 1

2. Write all numbers as the product of its prime factors

Prime factors of 85 = 5 . 17

Prime factors of 561 = 3 . 11 . 17

3. Choose the common prime factors with the lowest exponent

Common prime factors: 17

Common prime factors with the lowest exponent: 171

4. Calculate the Greatest Common Factor or GCF

Remember, to find the GCF of several numbers you must multiply the common prime factors with the lowest exponent.

GCF = 171 = 17