What is the GCF of 640 and 1999?
The GCF of 640 and 1999 is 1.
Steps to find GCF
- Find the prime factorization of 640
640 = 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 - Find the prime factorization of 1999
1999 = 1999 - To find the GCF, multiply all the prime factors common to both numbers:
Note that there are no common prime factors. - Therefore, GCF = 1 (since 1 is a factor of every number)
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GCF Calculator
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The greatest common factor (GCF) is also known as greatest common divisor (GCD) or highest common factor (HCF).