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What is the GCF of 15 and 198?

The gcf of 15 and 198 is 3.

Steps to find GCF

  1. Find the prime factorization of 15
    15 = 3 × 5
  2. Find the prime factorization of 198
    198 = 2 × 3 × 3 × 11
  3. To find the gcf, multiply all the prime factors common to both numbers:

    Therefore, GCF = 3

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

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