What is the GCF of 639 and 7938?
The GCF of 639 and 7938 is 9.
Steps to find GCF
- Find the prime factorization of 639
639 = 3 × 3 × 71 - Find the prime factorization of 7938
7938 = 2 × 3 × 3 × 3 × 3 × 7 × 7 - To find the GCF, multiply all the prime factors common to both numbers:
Therefore, GCF = 3 × 3 - GCF = 9
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The greatest common factor (GCF) is also known as greatest common divisor (GCD) or highest common factor (HCF).