Solutions by » GCF of two numbers

What is the GCF of 90 and 1399?

The GCF of 90 and 1399 is 1.

Steps to find GCF

  1. Find the prime factorization of 90
    90 = 2 × 3 × 3 × 5
  2. Find the prime factorization of 1399
    1399 = 1399
  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).