Solutions by » GCF of two numbers

What is the GCF of 305 and 69?

The GCF of 305 and 69 is 1.

Steps to find GCF

  1. Find the prime factorization of 305
    305 = 5 × 61
  2. Find the prime factorization of 69
    69 = 3 × 23
  3. To find the GCF, multiply all the prime factors common to both numbers:

    Therefore, GCF = 1

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The greatest common factor (GCF) is also known as greatest common divisor (GCD) or highest common factor (HCF).