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What is the GCF of 21 and 8?

The gcf of 21 and 8 is 1.

Steps to find GCF

  1. Find the prime factorization of 21
    21 = 3 × 7
  2. Find the prime factorization of 8
    8 = 2 × 2 × 2
  3. To find the gcf, multiply all the prime factors common to both numbers:

    Therefore, GCF = 1

The greatest common factor (gcf) is also known as greatest common divisor (gcd) or highest common factor (hcf).

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