Solutions by » GCF of two numbers

What is the GCF of 490 and 839?

The GCF of 490 and 839 is 1.

Steps to find GCF

  1. Find the prime factorization of 490
    490 = 2 × 5 × 7 × 7
  2. Find the prime factorization of 839
    839 = 839
  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).