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What is the GCF of 9 and 7?

The gcf of 9 and 7 is 1.

Steps to find GCF

  1. Find the prime factorization of 9
    9 = 3 × 3
  2. Find the prime factorization of 7
    7 = 7
  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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